Howdy folks,
I recently purchased a ZWO 183MM Pro camera with the built -in filter wheel (183GT). Last night was first light utilizing the camera with a 6-inch Newtonian which has a focal length of 518mm and a focal ratio of 3.45. Images from this combination demonstrated rather significant vignetting. Obviously, this is not an ideal telescope for this camera.
For those of you with experience with the 183MM, what are telescopes that you use with this camera that will yield images with minimal to no vignetting.
Thanking you in advance.
Clear skies,
Kevin Dixon
ww.magnificentheavens.zenfolio.com
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Hi, I also have the 183MM-Pro, but with a separate filter wheel and a 6" Newtonian telescope with a 600mm focal length. I haven't noticed any vignetting on my setup; everything works perfectly. By the way, it's best to match the telescope to the camera using this tool: https://astronomy.tools/calculators/ccd_suitability |
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Thank you very much Michal. Can you please tell me which Newtonian you are using and if you are using a coma corrector, which brand is it?
Clear skies,
Kevin
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GSO 150/600 with Baader MPCC Mark III coma corrector. The biggest issue is that even after replacing the spider with a CNC version, it still needs to be collimated occasionally, and I think I'll never find the perfect backfocus (I tried the Baader VariLock, but the stars at the edges always looked like comets). Other than that, everything's good  I was thinking about buying the Starizona Nexus 0.75 focal reducer/coma corrector, but since you're experiencing coma at that focal ratio, I'm not sure if I should take the risk.
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I have used the ASI183MC Pro on both a RedCat 51 (FL 250 mm) and a ZWO FF 107 (FL 750mm) with no vignetting issues that I can detect. The inherent amp glow is really handled with appropriate calibration subs. Hope this helps.
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Thank you Michal. I was using the 183GT with a SkyWatcher 6-inch Quattro Newtonian and the corresponding coma corrector. I will next try the camera with the Nexus focal reducer/corrector to see if it might be the SkyWatcher corrector that is the issue.
I speak from considerable experience that the Nexus unit is remarkable. I have used it with 6, 8 and 10-inch Newtonians and a Starlight Xpress CCD camera with wonderful results. I would not hesitate to recommend it to you.
And, thank you Michael. I have refractors in the same general focal length as you so I will have to try the 183GT with both of them.
Clear skies,
Kevin
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If I could ask a favor—once you get the Nexus, please let me know how it performs. I'm very curious about the results, and I must admit that a wider field of view and a faster focal ratio are very tempting (hope my 3nm Antlia filters are good enough for faster telescopes)
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I use an ASI183MM on a Sky-Watcher Quattro 150P with included CC and also a Starizona Nexus and have no issues with vignetting. That telescope can illuminate APSC sized sensors and is a really good image scale match for your camera. The vignetting is probably coming from your imaging train, somewhere between the camera sensor and the coma corrector.
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Thanks Rob. The 183GT features an internal filter wheel whereas the 183MM does not. I am wondering if that difference can be the cause of the vignetting. I have also used the 183GT with the SkyWatcher Starlux Mak-Newt (no coma corrector) and an Askar 230mm refractor and got no vignetting. I am thinking the Quattro 150 coma corrector may be the issue. I will try it next with the Nexus reducer/corrector.
Clear skies,
Kevin
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Michal,
The above image of M45 was taken with a SkyWatcher 6-inch Quattro Newtonian, a Starlight Xpress Trius 694 CCD camera and the Nexus reducer/corrector. Very pleasing results. I am going to try using the 183GT this evening with the 6-inch Quattro and the Nexus reducer. If I am able to acquire images, I will share them with you tomorrow.
Clear skies,
Kevin
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I use a 183MM on an Astro-Physics Traveler (105mm refractor, 663mm FL with field flattener). No vignetting. And as others say, the apparently large amp glow calibrates out easily. See for an example https://www.astrobin.com/lu8ys9/.Good luck and clear skies, Jeff
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Thanks very much Jeff!
Clear skies,
Kevin
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I meant to comment on your image of the Tulip. It is a beautiful image. Nicely done.
Clear skies,
Kevin
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Hello,
With fast scope, vigneting may occur due to the small filter wheel built in the 183GT (not in the 183MM). Try without filter just to see if vignetting change or not?
CS
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Michal - the above image of the Pac Man nebula was captured with the 6-inch SkyWatcher Quattro Newtonian with the Nexus reducer/corrector and the ZWO 183GT. I am pleased to note that there is minimal vignetting with the Nexus unit. I hope this helps.
Clear skies,
Kevin
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Thanks ManuManu - I think that the vignetting that I experienced may have been due to an improper backfocus by not using the necessary adapters to achieve the required backfocus.
Images takne last night with the proper backfocus show minimal vignetting.
Clear skies,
Kevin
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Hi Kevin. You might consider running another set of darks for that Pac Man image. You can remove the rest of the amp glow on the right.
Best,
Jeff
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Thank you for the great suggestion Jeff. I thought it might be amp glow and your analysis confirms it. I will be certain to take darks to remove the amp glow.
Clear skies,
Kevin
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