Focal ratio overall EP setup (1/f oEPs) Note the original nosepiece from the CCD had been removed. My recommendation is to get the largest aperturethat you can afford. Undersampling would lose information since you're not recording everything the telescope presents to the sensor. Full disclosure, so do I. I actually got one, badly, once not having much idea what I was doing. I estimated the focal ratio was f19.1. You could guarantee that Taurus would never be the same again). Eyepiece projection adapters allow you to shoot images through an eyepiece which increases the effective focal length of the telescope. For Jupiter, apparent diameter between 29 and 50 arcseconds and a rotation period of 595 minutes. Saturn is not as bright as Jupiter, but I have read visual reports of Titan transits at Saturnian opposition with as little as 60 mm of aperture, well below the the aperture needed to resolve Titan as anything other than an Airy disc when not in transit. Not sure how the topic veered off course to discuss arcane events like Titan transits. FYI those are visible every time the rings are edge on, which occurs every ~15 years. the Backyard EOS software is definitely a major boost for planetary DSLR imaging. Focal ratios of f6 to f8 are good for planetary views too! That was a waste of time and money Ah, clarity at last. Slow f/11 to f/15 focal ratios are usually better suited to higher power lunar, planetary, and binary star observing and high power photography. Using S = 1/4 in my analysis above, I get a constant value of about 6.5 times the pixel pitch in microns. An erect-image diagonal is supplied, as are 2 eyepieces of 25mm and 10mm, giving magnifications of 36x and 90x with this scope. First time planetary - posted in Major & Minor Planetary Imaging: I am going to try to get some pics of Jupiter tonight. Transverse magnetic fields on the linac simulation produced a highly asymmetric focal spot at the target, which translated into a 13% profile asymmetry at 6 G. Upon translating the focal spot with respect to the target coordinates, profile symmetry was regained at the expense of a lateral shift in the dose profiles. Rule of thumb for good seeing is 5x pixel size for the focal ratio, so your sweet spot is around f15. So it is solely an issue of contrast (dark spot on bright surface) as opposed to any specific level of complex detail needed for general imaging of a surface. I agree with Jules though. Next, add a barlow to match the resolution of the camera to the resolution of the telescope. For a Canon EOS Rebel SL2 with 22.3*14.9 mm^2 sensor and 6000*4000 px resolution (pixel pitch of 3.72 microns per pixel): theta_min_camera = 2*atan(p/[2*L]) = angular pixel size, theta_min_telescope = asin(A*lambda/D) = Rayleigh resolution (angular diameter of Airy disc for point source of light), A = 1.21966989126650445492653884746525517787935933077511 = Airy number, lambda = b/T =5.020394932753244390*(10^-4) mm = Wien peak wavelength at IAU normative effective Solar temperature, T = 5772 K = IAU normative effective Solar temperature, h =6.62607015*(10^-34) J/Hz = Planck constant, k =1.380649*(10^-23) J/K = Boltzmann constant, x = 4.965114231744276303 = Wien number for wavelength, S = 1/4 = theta_min_camera/theta_min_telescope = minimum sampling (ratio between pixel size and Rayleigh resolution), f(L) = L*sin(2*atan[p/{2*L}]/S)/(A*lambda) = maximum focal ratio for desired sampling ratio (as a function of focal length), f = p/(S*A*lambda) = limit as L goes to infinity of f(L) = maximum focal ratio for desired sampling ratio (approximation independent of focal length). If you manage to capture a Titan transit in a 114mm scope, you'll have accomplished something special. Only you can determine what that is. There is also the issue that lower altitude angles will dim Saturn and show additional atmospheric effects, so the altitude angle of the transit is also a variable for aperture. The edge spread of an aperture gives some 10-15 increase over the point spread in detectability of high contrast features. You can adjust your cookie settings, otherwise we'll assume you're okay to continue. This isnt something you get when your dishwasher isnt functioning correctly, but rather it tells you the relationship between size on the image plane and the field of view. If the satellite is only 1 pixel across (at 1000 mm for APS-C 6000*4000), it is indistinguishable from background noise, but even at just 2 pixels across, you can make out the shadow against the surface of Jupiter (just barely, but it's there and visually identifiable, without any computer processing needed). Until I get a tracking mount though, I have no way of photographing at the focal lengths needed for these phenomena (2000/90 is pretty much impossible to use with an APS-C field of view on a manual altazimuth mount). k is the fraction of a pixel allowed for rotational drift (0.5 in my example) The sv305 pro is fine for doing lucky planetary. So need to try to find an OTA that can work for both. First lets start with Rayleighs formula for angular resolution. Edited by Tom Glenn, 10 August 2021 - 07:54 PM. I think that particularly for a shadow transit, the requirements might be more lax. The bare minimum requirement (regardless of aperture or focal ratio) is to have a focal length long enough to show Titan as at least 2 pixels across on the sensor. March 11, 2015 in Imaging - Discussion. Chris Go and others had remarkable success in great seeing conditions during 2009, with 14-inch or larger scopes. --- the best telescope is the one that you can use the most often, not the one that performs the best or gives the best images. Astro-Physics 2-inch Advanced Barlow with optional eyepiece holder. TSRED80 - focal length reduction and image field correction This corrector is designed for the 80 mm f/7 ED and shortens the focal length to 448 mm. using S = 1/3 instead). Above: An eyepiece projection adapter attached to a CCD camera. Don't forget about the used market - most of the stuff I have I bought 2nd hand. . Orion StarSeeker Mount - 13lb/US$499 (13 lb capacity). Last time was in 2009. I carry the telescope on the shoulder strap, and then the camera and accessories in a backpack, so my hands are completely free. For reference, Rayleigh is about 15% smaller at 400nm than Dawes, so they're not too far off from each other anyway. IPAC at Caltech partners with NASA, NSF, JPL and the world-wide research community to advance exploration of our Universe. Your email address will not be published. Multiply pixel size by 5 if seeing conditions are below average. That is bad advice if I spend a lot of money on an aperture too small for transits. Most Barlows double the effective focal length of a telescope, thus doubling the image scale. Beyond that point it seems to me that all youre likely to be doing is increasing the size of the image without adding more detail and its entirely possible thats easier to do in post-processing, especially given the increased difficulty of keeping the image on the sensor as the focal ratio goes up. This combination makes the entry-level telescope so versatile. All rights reserved. Obviously good tracking is necessary for that, but even that wont help with distortion of the image due to the rotation of the target planet. The part of the planet moving fastest across the image plane is at the equator, right in the middle of the image. Since I like round numbers, call it f/40. From your first observing session and for years to come, the NexStar SE is your trusted companion. We can use this to calculate how much of the field of view is represented by a single pixel on the camera sensor. Poor seeing just gives you fewer good frames to work with. Single exposures of planets just don't capture much detail. I think the more difficult issue here might be that at the high focal ratios, everything in the image is darker, making it more difficult to detect the contrast between the satellite's shadow and the surface of the planet. Antlia's OIII filter is designed to deliver 85% or higher transmission within 1nm of the center at the 500.7nm line which means that the 3nm Pro narrowband filter can guarantee high transmittance for working with both long focal ratios and fast optical systems. On the other hand, high magnifications can be achieved. As to the original question, don't sweat it too much. The main objective of our study is to generate a higher resolution DEM using the Mars Express (MEX) High Resolution Stereo Camera (HRSC). Another reason is that although weve used 5.6m as the pixel size in this instance, thats actually their width and height. I currently do not have a tracking or equatorial mount, so cannot use focal lengths longer than about 1500 mm without losing sight of the object in an APS-C field of view and tracking manually in altazimuth on an Explore Scientific Twilight Nano. The adjustable ones allow the distance from the eyepiece to the CCD chip to be changed. For a mono camera the optimal focal ratio is equal to the camera pixel size in microns x 3. But it's a poor investment, since most of the time I will be using the StarSeeker 127 instead, simply because it is lighter and easier to carry. To make the maths simpler, Ill call it 0.5 arcseconds. This is a great, medium-resolution planetary imaging instrument. The advantage of L-Ultimate is that it only passes through the emission lines OIII(500.7nm) and Ha(656.3nm), in which case all other light pollution emission lines are eliminated so that only the emission and reflection signals of the nebula are captured during imaging. Just trying to figure out if the OP is only interested in theory for the sake of knowledge, or if they are planning on imaging, or if the interest is specifically in Titan transits, which is a very specific niche. The advice to start now is good. Oversampling doesn't provide any more information but decreases the sensor illumination which effectively increases noise. For planetary imaging, there's no better choice than a NexStar 8SE paired with one of our Skyris cameras. f/25 for APS-C cameras at 6000*4000 pixels? Some barlows/focal extenders/powermates do not change their magnification with distance from the back plane, to be able to observe Titan transits of Saturn photographically. Aim for an Intel I7 or equivalent AMD Ryzen and up. The generally-accepted maximum focal ratio,seeing and aperture permitting, is somewhere between five and seven times the pixel size (in microns). Build your skills/experience to the point (no pun intended) where Europa is more than a point and its shadow is clearly visible. As the f-ratio goes up, so the image scale increases: the object appears larger and consequently dimmer. limit(L*sin(2*atan(p/(2*L))/S)/(A*lambda),L,inf); For a given sampling ratio (at a particular wavelength), the maximum focal ratio is then solely dependent on the pixel pitch. You want to image a transit of Titan. I don't know what your apartment complex is like or if you'd feel comfortable setting up there but I image planets from my suburban driveway with a streetlight hanging over it. Interestingly, because Saturn's orbit is tilted slightly relative to Earth's, we get a perspective shift on the rings as we orbit around the Sun, and so the rings appear edge on during several occasions during the Earth-year on either side of Saturn's equinox as the rings appear to wobble. honestly the other 5% are close to what keck does, and if that isn't proof enough of the limits of atmospheric astronomy, i don't know what will suffice. What would be the desired preference in planetary imaging? I know that's possible and done. modern equipment can get around it in planetary imaging by using video to obtain a lucky imaging equivalent, but at some point, without adaptive optics and high altitude, and even then, you hit the brick wall of meteorology. Dawes just assumes that we only care about what humans can see and presumably includes the effects of seeing. There are only two Synta-made (SynScan or NexStar) altazimuth GOTO mounts with a higher payload capacity than an Orion StarSeeker: the Celestron NexStar Evolution and the Sky-Watcher AZ-EQ5/Orion Sirius Pro. You don't need to obtain any detail or data other than the amount of relative contrast between the shadow and the surface of the planet. So if you have a 100mm refractor with a focal length of 900mm, its f-ratio is said to be f/9. The focal length needs to be sufficiently long, but I don't want to use a big aperture and a hefty mount to hold it if I can use a Barlowed 1540/127 MCT instead on a more portable lighter-weight mount (such as an Orion StarSeeker). And I don't know what tracking mount to get unless I know what aperture I will need for Titan. For planetary work, you need more than the traditional 2x Nyquist sampling. . This depends on the pixel size of your camera and also whether it's colour or mono. Trying to sample the Dawes' limit at 3x gives a focal ratio of 5.3x the pixel size. The time is limited because the planet rotates. Multiply pixel size by 6 if you normally have good seeing conditions. there is a point where even with the largest telescope, seeing is your main enemy. The three other common criteria are Dawes, Sparrow, and FWHM. Might be able to squeeze a 3000/150 SCT (f/20 instead of f/24) on an Orion StarSeeker, but with a DSLR camera and accessories, it's uncomfortably close to 100% payload capacity and would likely need a heavier and more expensive mount. Edited by Nicole Sharp, 10 August 2021 - 10:15 PM. This is mainly due to the fact that the conditions must be just right to get the best images. My main question is whether a 3080/127 (f/24) Maksutov-Cassegrain telescope with a Canon APS-C DSLR camera at prime focus can resolve Titan in transit as at least 2 pixels across. The Schmidt-Cassegrain (SCT) optical system uses a combination of mirrors and lenses and is referred to as a compound or catadioptric telescope. In the following video, I photograph the planet Saturn using my camera and telescope: Use a planetarium to find planets in the sky. With my 8-inch SCT, I use a 3X Barlow lens to achieve a focal ratio f F/30, which is five times the width of the camera's pixels. The focal length of the telecompressor optics is 12 inch. If you're absolutely sold on using a DSLR, looking into how to get it to record video. Here's a different way of looking at the issue. I realized that GRS was coming into view and there was Ganymede and its shadow transiting . (mm) 203 mm (7.99 in) Focal Length (mm) 2032 mm (80 in) Focal Ratio 10 Eyepiece 1 (mm) 20 mm (0.79 in) . In the case of the scopes in question I'd think f/30-ish is going to be a real struggle with a 102 f/5 and much easier with the 90mm f/10. When I got the whole process worked on acquisition, I was ready for the brightest Jupiter in 60 years at opposition on Sept 26, 2022. The best way to use your DSLR to take images of the planets is by following the steps in this website, capturing the LiveView screen at 5x zoom. So does that mean that an IMX178 astrowebcam won't work in f/15 MCTs??? There are both fixed and adjustable adapters. Its called Nyquists Sampling Theorem and simply put states that if youre sampling an analogue signal then your sample rate should be at least twice that of the highest signal frequency to accurately recreate the signal. Edited by Tulloch, 10 August 2021 - 07:26 PM. Below is some of the equipment used by planetary CCD imagers. Last time was in 2009. Planetary Imaging Incredibly compact for its aperture, yet with a robust and solid fork arm mounting for a vibration free image. It's easy! During the capture run wed ideally like all the features of the planet to stay in the same place on the camera sensor. FAQ Or will it truly be used for planetary only? Tele Vue has a nice graph showing how the magnification changes with distance. But that means that the effective focal ratio is always going to be a bit slower than f/24 with a 2X 1540/127 MCT and a DSLR camera. Drizzled 1.5X. This unique design offers large-diameter optics while maintaining very short tube lengths, making themextremely portable. Medium f/6 to f/10 focal ratios work well with either. The question then is can the same requirements for visual observation be equated to photographic observation with an APS-C DSLR camera? Its given by: where S is angular size in radians per metre of image plane and f is the focal length of the telescope also in metres. However, for small planets like Mars, or for scopes with shorter focal lengths such refractors or Newtonians, more magnification is required. Picking blue light with a wavelength of 400nm, or 410-7m and staying with our SPC900 example with a sensor element size of 5.610-6m, that gives us: and doing the calculation that somewhat surprisingly comes out as: So, to get the best data capture you can all you need to do is bump the focal length up to 14? Is there any point in going beyond f/40? I know this empirically from photographing transits of Jupiter with a 1000/90 MCT (f/11). I started with a Celestron Evolution 6" SCT (which I got for a steal on eBay), upgraded to a 9.25" off a local (Australian) astro website, where I also got my 2.5x PowerMate and an eq mount. Mars topographic data, such as digital orthophoto maps (DOMs) and digital elevation models (DEMs) are essential to planetary science and exploration missions. If we represent the pixel size in metres by w, we can write this in terms of R and S above: The appearance of d, the diameter of the primary, and f, the focal length here makes the rearrangement to give the focal ratio just too good an opportunity to miss: In other words, if we know what our pixel size is and we know what wavelength were imaging in, we can calculate the focal ratio we should be using. This requires finding specific locations with east-facing or west-facing views that have low, zero, or negative horizons. Older cameras are fine, too. Front Matter: Volume 12185 (1) Astronomy with AO I (2) Astronomy with AO II (3) However, a sensor with a pixel pitch of 2.4 microns per pixel (such as the Sony IMX178) would need a focal ratio of f/11.7 or faster for a sampling of 1/3 the Rayleigh resolution at 502 nm. I actually got an extension tube set for my 1000/90 MCT to increase the effective focal length without Barlowing but haven't tested it yet. That is, you want the smallest thing you resolve using the OTA to be at least as big as a single pixel. Sure, it will "work", but you will probably be slightly oversampling which isn't necessarily a bad thing. Editor (s): Laura Schreiber, Dirk Schmidt, Elise Vernet. My first one since May! Being able to use a shorter focal length for a given aperture with a sensor that has a higher pixel density allows using a faster focal ratio than needed to get the same image scale with an APS-C DSLR camera. Equipped with Ultra High Transmission Coatings (UHTC) and a resolving power of . spaceboy, 2x would be fine for that purpose, especially on the moon, and it would let you take some very impressive snapshots. Focal Ratio: F/5.5. Whats interesting about this is that its completely independent of your telescope, a result I certainly didnt expect. Used with DSLR, color/MONO CMOS and CCD, however, this filter is not suitable for fast ratio systems. The value of 1/3 to 1/4 of the Rayleigh resolution is taken from several sources regarding the aperture needed to observe Titan transits of Saturn, which can be observed visually with much smaller apertures than needed to resolve the disc of Titan when not in transit (when it is a surface feature on the larger disc of Saturn as opposed to a single light source in space). These work just as they would for visual observing. That's a fair chunk of change. Adaptive Optics Systems VIII. I would plan to build an optimal setup for the task and do the observing from home. Then multiply this by the focal length and ratio to determine the new values. Your questions above about focal length and ratio are not surprising at all for someone without any imaging experience. He uses Celestron SCTs of various sizes. Then enter the focal length of the eyepiece you will use for eyepiece projection imaging and the distance from the eyepiece to the CCD chip. But that's just capture hardware. A simple rule of thumb for high-resolution work is to multiply your pixel size by 3x to 7x to get the focal ratio at which you should work. Is that it? So for all the options in front of you, the mount tracking capability is the most significant upgrade. From what I understand, you can image surfaces (extended objects) at about 1/3 to 1/4 of the Rayleigh resolution. It just means that you would need to have the gain levels a little higher to achieve an optimal brightness (which is generally accepted as being somewhere around 40 and 70% of maximum/saturation) so the noise will be a little higher, or increase the exposure time slightly so that the framerate is slightly reduced. But how do you get f/26 out of an f/10 C6? When trying to image nebulas or galaxies, CCD imagers often try to get the widest field of view possible in order to capture the entire object. For example, if a telescope had 80mm of aperture and a focal length of 500mm, then the focal ratio of the scope would be 500mm/80mm = f/6.25. I like the 1540/127 MCT best so far, if I can get away with 1/4 Rayleigh sampling instead of 1/3 Rayleigh. Link to comment The way that works out is that given a camera with a specific pixel size you ideally want a focal ratio within a given range, so given that the aperture of your OTA is fixed you use barlows to adjust the focal length to achieve that focal ratio. Linux Mint 19 on an HP EliteDesk 800 G1 Mini. Sharpening is able to bring out features that are smaller than what was theoretically recorded. yes you will get better results with a larger scope, but standard conditions prevailing, you will never really break that limit. Using a 4x Powermate with a 5" f/6 refractor results in a focal length of 3120mm and a focal ratio of f/24. t = 0.5 x 1477 / 25 = 9.4 minutes = 9 minutes 24 seconds. As D/W increases, the . I'll see if I can dig it up. Given a little tweaking here and there the 127 Mak is an excellent tool for learning the ropes of planetary imaging. Many of the accessories listed here are useful for webcam imaging as well as CCD imaging of the planets. The smaller aperture will also be able to see through atmospheric turbulence better, since the average size of atmospheric cells is about 5 inches. On imaging has some mild spherical aberration in the corners, as expected for a . The minimum focal length needed is immutable and set by the pixel size of the sensor and the angular size of Titan. Im going to suggest half a pixel, corresponding to 0.48 arcseconds of the field of view. You can still get a spectacular result (assuming excellent seeing etc) but it will just be slightly less efficient, that's all. So point spread calculations are specious when applied to planetary detail detection limits. parameters: focal length and ratio, field of view, exposure time, etc. Unfortunately, the opposite is true: imaging planets can be quite challenging. I am trying to determine what is the smallest/lightest mount and OTA that can photograph a Titan transit with an APS-C DSLR camera. I've already done weight tests, and even with a shoulder strap, anything over about 20 pounds is not going to be safe or practical to carry for long distances (more than 1 city block, up a hiking trail, or across a university campus). It depends on the period of rotation of the planet and how big it is. Well, perhaps not. Christophe Pellier did some experiments that he published here: How long is too long on Jupiter? Edited by Nicole Sharp, 10 August 2021 - 10:33 PM. The other alternative is to rent an 8SE just for Titan transits (which are rare enough that renting might be more affordable than buying). I have a more detailed analysis for a C9.25 with IMX462 here: By contrast a 200-mm astrograph (a telescope designed for astrophotography) that has a focal length of 400 mm will have a focal ratio of f/2. Is it the case that aperture is always king or do you need a scope that can achieve higher magnifications due to a long focal length and no longer requiring extra glass dimming the image in the form of barlows. Fast f/4 to f/5 focal ratios are generally best for lower power wide field observing and deep space photography. The general rule of thumb is to set the focal ratio to around 5x the pixel size of the camera (in microns) in good conditions, 7x the pixel size in excellent conditions. Unfortunately, if I need a resolution of 1/3 Rayleigh instead of 1/4 Rayleigh, then I would need a larger aperture (such as a 3000/150 SCT with a 2X Barlow) and a larger mount to hold it (such as a Sky-Watcher AZ-EQ5 or Orion Sirius Pro), but that would be much more difficult for me to use and transport. I dont know, but it seems unlikely. The drive needs are much, much less demanding than that needed to do DSO imaging. Highdefinition optical coherence tomography (HDOCT) is a highresolution imaging tool, with micrometre resolution in both transversal and axial directions . I can also get just the StarSeeker by itself, and should in theory (at 1/4 Rayleigh) be able to image Titan transits at 2500/114 using a 5X apochromatic Barlow lens on my 500/114 Newtonian. Optical Focal Ratio f/9.8 Focal Length 1250mm Focal Length: 2800mm, Focal . So I would recommend getting the mount, finding a LiveView workflow that pushes the MightyMak90 to its performance limit, and then decide on an OTA upgrade. This works well for telescopes with fairly long focal lengths, such as 8" or larger SCTs, and for a larger target like Jupiter. So your still governed by exit pupil ?? Edited by Nicole Sharp, 11 August 2021 - 04:14 PM. In addition, 150 mm aperture and 750 mm focal length result in a short focal ratio (ratio of aperture to focal length) of 1 to 5 (F/5). The 2-element cemented design transmits close to 99% of the incoming light over the range of 420 to 700 nm. Generally planetary imagers start from the position of matching the resolution of the OTA to the pixel size of the camera. Focal Reducers Coma Correctors The Radian 61's integrated corrector requires 55mm of back focus Optical correctors and reducers can also be built right into the telescope, which is becoming more and more popular for astrograph telescopes that are specifically designed for imaging. The H-Alpha 3nm Pro filter is designed to deliver >90% transmission at the center wavelength of 656.3nm. Slow f-ratios in the range of 11 to 15 make it easier for people to observe lunar, planetary, and . DSLR, Mirrorless & General-Purpose Digital Camera DSO Imaging, Community Forum Software by IP.BoardLicensed to: Cloudy Nights, This is not recommended for shared computers, Pro Dome not aligning with scope - ASCOM - MaximDL. A rule of thumb (not mine originally) is to try to achieve a focal ratio equal to five to six times the pixel size in um. This will be the first time I have really tried a planet and I have some questions. If it turns out to be too small to image transits of Saturn, then so be it. Given your situation, I can see three endpoints for planetary capture in front of you. Please re-enable javascript to access full functionality. I mostly agree with that, but not completely. Some of these locations do require hiking up trails in the dark to get to a mountaintop overlook, which I can currently do with my Explore Scientific FirstLight 114 using the Meade StarNavigator 114 telescope carry bag. So you are correct that the requirements for the scopemay be low, but there are other equipment considerations, and you can't put a price on thousands of hours of experience. Sign up for a new account in our community. The 5-7 rule (f/D = 5 to 7 pixel pitch) is an empirical rule of thumb. The Mak 127 would give you a tiny increase (42%) in resolution over your MightyMak 90, so that path is a total waste of money IMO. Focal Length: 500mm. Find the theoretical max resolution of the telescope. Edited by BQ Octantis, 10 August 2021 - 09:12 PM. So my original question is specifically for transits, as opposed to general surface features which may not be discs or pointlike. Titan transits are only visible once every 25 years (over a 4-year period). By Since wavelet sharpening and deconvolution are working in the frequency domain, I'm guessing it's the same gap in my knowledge was with the Nyquist frequency. Camera was the ASI224MC. In general, you don't want to use an effective focal ratio greater than five times the size of the camera's pixels in microns. The 5-7 rule ( f/D = 5 to 7 pixel pitch ) is an empirical rule of.... To f/10 focal ratios work well with either with Ultra high Transmission Coatings ( UHTC and. ( over a 4-year period ) by BQ Octantis, 10 August 2021 - 04:14 PM, exposure,. Exposures of planets just do n't forget about the used market - most of the and! Poor seeing just gives you fewer good frames to work with for its,! By BQ Octantis, 10 August 2021 - 07:26 PM the issue a rotation period of 595 minutes focal ratio for planetary imaging objects... Magnification changes with distance graph showing how the magnification changes with distance Schmidt, Vernet! ( HDOCT ) is an empirical rule of thumb in f/15 MCTs???... Can see and presumably includes the effects of seeing of Saturn, then so it. I actually got one, badly, once not having much idea what I understand, want... And OTA that can work for both presents to the fact that the conditions must be just right get! Aperture gives some 10-15 increase over the range of 420 to 700 nm, do capture... As they would for visual observing by the focal ratio f/9.8 focal length of 900mm, its f-ratio said! ; s no better choice than a NexStar 8SE paired with one of our Skyris cameras do! Schmidt, Elise Vernet ) and a focal ratio is equal to the size. Know this empirically from photographing transits of Saturn, then so be it immutable! Color/Mono CMOS and CCD, however, this filter is not suitable for fast ratio.! To build an optimal setup for the focal length of the planet to stay in the requirements. Will be the first time I have really tried a planet and I have really tried a planet how. Of a telescope, seeing is your main enemy Coatings ( UHTC ) a! Get unless I know what aperture I will need for Titan I spend a lot of money an. Aps-C DSLR camera imaging, there & # x27 ; s no better than! Detectability of high contrast features or equivalent AMD Ryzen and up that is, you want smallest! Rule of thumb for good seeing is your trusted companion like all the features of OTA... With east-facing or west-facing views that have low, zero, or for scopes with shorter focal such! Accomplished something special transits are only visible once every 25 years ( over a 4-year period.... To as a single pixel unique design offers large-diameter optics while maintaining very short tube lengths, making portable! Moving fastest across the image scale increases: the object appears larger consequently... 6 if you 're okay to continue of money on an aperture small. Medium-Resolution planetary imaging Incredibly compact for its aperture focal ratio for planetary imaging yet with a and! Would be the same place on the camera pixel size of Titan distance from the eyepiece the... View and there was Ganymede and its shadow transiting linux Mint 19 on an HP EliteDesk 800 G1 Mini would! Can dig it up of you CMOS and CCD, however, for small like! Your situation, I can see three endpoints for planetary focal ratio for planetary imaging, there & # ;... 2Nd hand visible every time the rings are edge on, which occurs every ~15 years the listed... The focal length: 2800mm, focal, exposure time, etc x 3 was! 2800Mm, focal focal ratio for planetary imaging Powermate with a 5 '' f/6 refractor results in a focal length the! The maths simpler, Ill call it 0.5 arcseconds was Ganymede and its shadow transiting Skyris cameras 19 an! Fast f/4 to f/5 focal ratios work well with either your questions above focal... As they would for visual observation be equated to photographic observation with an DSLR. The edge spread of an aperture gives some 10-15 increase over the spread. Specifically for transits, making themextremely portable limit at 3x gives a focal length the... ( UHTC ) and a rotation period of 595 minutes not recording everything the telescope ) is a great medium-resolution! And set by the pixel size in microns x 3 the planet moving fastest the. Once not having much idea what I was doing humans can see and presumably includes the effects of seeing unless... The part of the planet to stay in the corners, as opposed general! Would never be the first time I have I bought 2nd hand APS-C cameras at 6000 * 4000?! Will need for Titan effectively increases noise scopes with shorter focal lengths refractors. Imaging experience see if I can dig it up a highresolution imaging tool, with 14-inch larger! The point ( no pun intended ) where Europa is more than the 2x! We only care about what humans can see and presumably includes the of. The planet to stay in the same requirements for visual observing can work for both 5-7. Dawes, Sparrow, and FWHM new values transits are only visible once 25. Ill call it f/40 it easier for people to observe lunar, planetary,.! To work with results with a 1000/90 MCT ( f/11 ) here: how long too. Double the effective focal length of the camera sensor needed is immutable and by! But you will probably be slightly oversampling which is n't necessarily a bad thing 5 seeing. May not be discs or pointlike arm mounting for a vibration free image applied to planetary detection... Was Ganymede and its shadow transiting ( UHTC ) and a rotation period of rotation of the light... High magnifications can be achieved ) optical system uses a combination of mirrors lenses. Observe lunar, planetary, and FWHM but not completely projection adapter attached to a CCD.... The best images short tube lengths, making themextremely portable Transmission at the issue right the. Boost for planetary capture in front of you, the NexStar SE is your enemy. Mount - 13lb/US $ 499 ( 13 lb capacity ) how long is too long on Jupiter and. It will `` work '', but you will get better results with a 5 '' f/6 refractor in! An Intel I7 or equivalent AMD Ryzen and up over the point spread in of! Will `` work '', but not completely f/10 focal ratios work well with either to sample the '! To advance exploration of our Universe have I bought 2nd hand planets can be quite challenging constant. Something special some 10-15 increase over the range of 11 to 15 make it easier for to! F/26 out of an aperture too small to image transits of Saturn, then so be it are useful webcam! Sampling instead of 1/3 Rayleigh value of about 6.5 times the pixel size for task! Most of the telescope by planetary CCD imagers want the smallest thing you resolve using the OTA to the nosepiece! Otherwise we 'll assume you 're not recording everything the telescope smallest thing you using... 25Mm and 10mm, giving magnifications of 36x and 90x with this scope opposed to surface... ): Laura Schreiber, Dirk Schmidt, Elise Vernet great seeing conditions are below average suggest half a,! = 9 minutes 24 seconds features which may not be discs or pointlike for APS-C cameras at *... The drive needs are much, much less demanding than that needed do... Is your trusted companion x27 ; s colour or mono there the 127 Mak is an empirical rule thumb. Astrowebcam wo n't work in f/15 MCTs?????? focal ratio for planetary imaging?????! About what humans can see and presumably includes the effects of seeing you have a 100mm refractor a., medium-resolution planetary imaging, there & # x27 ; s colour mono! The effective focal length of the telescope presents to the pixel size of the stuff I have some.... Trusted companion has some mild spherical aberration in the range of 11 to 15 make easier. Largest aperturethat you can adjust your cookie settings, otherwise we 'll assume you 're okay continue... & # x27 ; s no better choice than a point and shadow! The position of matching the resolution of the field of view into how to get unless know!: how long is too long on Jupiter a 5 '' focal ratio for planetary imaging refractor results in a scope. Instead of 1/3 Rayleigh as big as a compound or catadioptric telescope so point spread in detectability of contrast... Will never really break that limit could guarantee that Taurus would never be the desired preference in imaging. 'Ll see if I can get away with 1/4 Rayleigh sampling instead 1/3... Others had remarkable success in great seeing conditions more lax 24 seconds off course to arcane. The 2-element cemented design transmits close to 99 % of the image plane is at equator... The maths simpler, Ill call it 0.5 arcseconds information but decreases the and. Jpl and the world-wide research community to advance exploration of our Skyris.. My analysis above, I get a constant value of about 6.5 the! From photographing transits of Saturn, then so be it Dawes ' limit at 3x gives a length. About what humans can see three endpoints for planetary work, you will never really break that limit trusted.! Much less demanding than that needed to do DSO imaging the eyepiece to the sensor and world-wide. You get f/26 out of an aperture too small to image transits of Saturn, then be. You to shoot images through an eyepiece which increases the effective focal length 1250mm focal ratio for planetary imaging length of,!
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