We also set additional cookies that help us improve your experience, perform analytics, and serve relevant ads. Fortunately the good frames are more than the bad frames. For a list of our dealers click here. All you need to do is check your collimation, the flexure in adaptors and focuser. You may have a bad coma corrector or multiple issues that reduce the ability of the corrector to do its job perfectly. Autoguiding was performed via ST4 with second chip of SBIG ST2000xm like previous time. This would be a weird problem to show in every frame the same. As you can see from previous MaximDL guiding graph for test 3 with VC200L I have these values, After performing star drift method for polar alignment, Ihave managed to reduce these values to. Optical aberrations: how to fix errors in your telescope. Hello - I've not yet approached the manufacturer, prior to doing that I'm looking for an opinion on these star shapes Is this something I've misconfigured or perhaps a scope issue? I adjusted the back spacing on the FF back and forth and even sent them a Bahtenov mask focus photo to verify to them the scope was indeed in perfect focus when taking photos accompanied by the example star shots. Once you are happy that the central diffraction spike isexactly between the X spikes, thats it. The fine adjustment is usually the smaller outer dial. The combination of the three different grating orientations on the Bahtinov mask creates three distinct diffraction spikes. November 24, 2014 in Imaging - Deep Sky. So this might be the reason the stars do not change position among the frames. I'm sure a quick search will provide you with more than enough information. Each method produces a range of aberrations, although some are common to both types. The pair isn't visible then you'll . Taking that little extra time to ensure your image is sharp and focused will reduce the frustration of seeing an otherwise good image ruined. Fix: Go with threaded connections only, or ensure your camera is (very) securely mounted (compression rings are bad). What exposures were you using and how many? I will say - every shot taken so far shows this. At least that's my experience with reducer/flattener vs flattener only. Step 9 Once centred, use the live-view magnifier feature to enlarge the live image to either x5 or x10 times. My comment about not saying anything useful was related to the fact that I mentioned three kinds of problems. Below, we'll explain what causes the most common aberrations found in amateur telescopes. For example; let's say you're taking a shot with a 24mm lens on a full frame . It is also a good setting if you want to take a test shot to check your focus in more detail. maximum exposure length (seconds) = 400 / focal length (for ~14-16mm) We most often shoot with a 16mm or 14mm lens when we go wide, so from our field tests, this works: ~28 seconds = 400 / 14mm. [if you load them into something like DSS and register/compute offsets, the dx and dy columns show this]. Many of the standard Bahtinov Masks available allow you to adjust the size by moving adjustable pins along a slot. When adjusting your focus, the aim is to get the focus distance number as close to zero as possible. If your tracking looks good but your stars are trailed then you might be seeing differential flexure between the main imaging scope and the guide scope. what it looks like when it's expanded. Well rounded stars give your image a crisp, professional look that we are all aiming for when imaging. 8:55 PM on Jun 1, 2023 CDT. I wound up closer to 60mm. The Flaming Star Nebula in Auriga has some fascinating structure, by Mike Soulby stellardiscovery.com. A lot of astrophotography setups can be very demanding. By making successive adjustments, you canput the The glass lens elements in a refractor are unable to focus all the colours of light at the exact same position because the refractive index of glass varies with the wavelength of the light passing through it, resulting in colour fringing. A defocused star test will show this distortion in the Airy disk. Strangely the pillar moves a little from the vertical after a few days and needs resetting. Learn more about Stack Overflow the company, and our products. But that starts allready quite near the center. The technical storage or access that is used exclusively for statistical purposes. Below I share with you how to achieve perfect star focus in your astrophotography images. What is the 500 Rule? Is it possible to do astrophotography with a camera and tripod and no tracker? Some aberrations can be seen during a star test, which is a process in which a bright star is examined out of focus and at high magnification. what do you mean by this? Step 2 If using a DSLR lens, ensure manual focus is selected MF. It ensures that the gears stay meshed and that the worm is lifting the weight. The movement of the focusing elements within a DSLR lens is internal, and you wont see the lens elongate or move whilst you adjust the focus. A second pair of Ontario eyes might not help here: to me the stars are either very fine in the center or fine enough that if you can achieve the same roundness across the field, edge to edge, you will probably be very satisfied :-) Regardless, your path to happiness (in the short term ;-) is to get round stars near to the edges. Round Star Tips By Jacob on February 6th, 2018 Astrophotography can be particularly challenging at times, with so many variables and potential problems to consider. One helpful tool is the Bahtinov Aid, which is part of the excellent Astrophotography Tool image acquisition software. Plan to be outside for several hours. Though not too obvious when observing through an eyepiece, coma becomes quite intrusive in images, especially when a large sensor is in use. Use Ctrl-H to toggle off the "marching ants". Does substituting electrons with muons change the atomic shell configuration? Is it some tilt of the focusser or something else? You are using the equivalent of a 600mm lens (200mm times 1.5 (crop factor) times 2 (doubler)). use the primary's 500 Divided By the Focal Length of Your Lens = The Longest Exposure (in Seconds) Before Stars Start to "Trail". The latter may be better carried out by a professional. Centre the star as best you can. likely be cooling off, and strange things can happen. Many challenges come with astrophotography, but one of the most critical skills to master is achieving pinpoint star focus in your astrophotography images. Also I have noticed some frames are affected by double-star effect. Last night I started a astrophotography session with my equipment. I have checked for cone error and can't see any but as I said I haven't been doing this long so have an awful lot to learn. First Go to the Lens Corrections tab. When a star is in perfect focus, the central spike will be positioned exactly between the two X spikes. Moving to an off axis guider will eliminate this. This reduction in light transmission will make using the live view feature to focus very difficult, if not impossible, even with a bright star in the centre of your view. Copyright 2021 Stargazers Lounge Diffraction problems (something sticking into the light path from the side) can show up across the field in all the stars. My guess is that the problem is probably with the scope. where a star will appear round even with no coma corrector being used) With same setup described above I slewed the telescope to Zenith and captured a sequence of 10 minutes exposures of M51. including the edge support of the mirror. Via this "eyeball" test all looked good - I could see straight back to the camera sensor. The astrophotography filters featured in this video are the DSLR clip-in models that install into the camera body, and 2 round mounted filters that thread intro your camera adapter or field flattener. Pinched optics can be corrected by slackening off the retaining clips on the primary mirror so that they just hold the mirror in place, or by careful adjustment of the lens cell in a refractor. back to its original orientation, Primary mirror strain-induced Also, disable any image stabilisation if your lens has this feature. I purchased the scope new in fall 2019, used it visually and have been pleased with performance, this is the first time I've attempted to set it up for astrophotography. Website: http://www.budgetastro.netTwitter: https://twitter.com/#!/BudgetAstroFacebook: http://www.facebook.com/BudgetAstroFlickr: http://www.flickr.com/phot. This proves that my mount has no mechanical problem. 1) What is the focal length of your camera lens or telescope? I would capture a test field with plenty of well-spaced, bright stars. CEO Update: Paving the road forward with AI and community at the center, Building a safer community: Announcing our new Code of Conduct, AI/ML Tool examples part 3 - Title-Drafting Assistant, We are graduating the updated button styling for vote arrows. ChrisIS When using a telescope or longer focal length lens, it is possible to use a star focusing mask to accurately check the focus, ensuring it is absolutely perfect. With 14 total picks, the Rams were the busiest team in the league over draft weekend, and added many more players as . Typical causes include the poor positioning of baffles within a refractor, a secondary mirror that is too small to fully intercept the light cone from the primary mirror in a Newtonian reflector or the use of narrow adaptor tubes to attach the eyepiece or camera to the telescope. However, the other four can be tackled successfully. By clicking Post Your Answer, you agree to our terms of service and acknowledge that you have read and understand our privacy policy and code of conduct. For all of the It may involve a bit more trial and error; however, with some patience and a deft touch, you can still easily achieve sharp star focus. On the basis I switched most of the kit between the 2 photos, I'm assuming it's either mount to camera related, but where to go from there I'm not sure. Before hitting GO on your exposure plan, it is worth taking a few final test shots to double-check that you are completely happy with your focus. There are two main types of primary mirrors used in Newtonian telescopes: lower cost spherical mirrors, which form part of a sphere and are supplied with low-budget telescopes, and the more popular parabolic mirrors, which are sculpted into the shape of a parabola. rather than "Gaudeamus igitur, *dum iuvenes* sumus!"? Edited by Kevin_A, 30 October 2020 - 11:08 AM. In a refractor, the individual lens elements are held in place within a cradle called a lens cell; in a reflector, the primary mirror is held in place by a series of small clips that hold the mirror in an adjustable carrier. The stars at centre are round but not at the corners and they differ at each corner. In doing this, we're looking to On Canon DSRL cameras, this is done using a wheel adjuster near the shutter button.
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