Ideal telescopes for ZWO ASI 183MM

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

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.

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

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.

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

I meant to comment on your image of the Tulip.  It is a beautiful image.  Nicely done.

Clear skies,
Kevin

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

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