so for a celestron 8" edge with hyperstar F2.1/425mm the 183 seems like it would work well, but with this scope I can also use focal reducer and shoot at F7/1422mm or F10/2032mm , at these longer focal lengths the 1600 would prob be the better choice, so do you think the better resolution at 425mm would justify the 183 over the 1600 ??
and what about the reflections of the sensor cover glass on the 1600, do you see the same problem with the 183 ?
I don't really think either camera would really be all that great at f/10...however, either should be ok at f/7, with the ASI1600 having the benefit of a larger FoV.
As for microlens diffraction. With VERY bright stars, I have seen a rather interesting diffraction artifact (I need to get some test data to show it), but I haven't seen the same kind of microlens reflections as with the ASI1600. I don't know exactly what causes the issue in the ASI1600, so I don't know whats different about the ASI183, but if you encounter any sensor diffraction with the 183 it's a more pleasing effect.
from what I have read the cover glass over the 1600 sensor is not ar coated, per Sam this is how the sensor is made so zwo can't do anything about it......was just curious if the sony sensor had ar coated cover glass or not and might have not have that same problem.....
I am far more likely to image at f7 or f2.1 , makes me lean towards the 183, with the smaller pixels it might allow me to image a few midsize targets at f2/1 rather than f/7 , since the higher resolution would allow me to crop a bit more of the image, and imaging at f/2.1 is soooo much easier....
thanks for your reply
Well, that's the assumption, that the cover glass is not coated. I don't know that anyone knows for sure what the exact cause of the microlens diffraction is, though, is my point.
I don't know if the cover glass of the IMX183 is coated or not either. I don't see any visual difference between the two cameras...nothing that indicates one is multicoated and the other not. I have seen diffraction effects with the IMX183 on bright stars...but as mentioned, it is a more interesting pattern without the grid of microlenses around the star.