I must confess that I've been overwhelmed with all the previous discussions related to this topic. I'd like to please ask my specific questions fresh as they relate to what I am wishing to do.
I wish to use my refractor for smaller scale imaging on tight FOV framing of DSO's, specifically galaxies. This is a TS 130mm APO refractor with 910mm FL. This is for monochrome LRGB or RGB imaging, primarily in a suburban light polluted environment.
Presently, using my FLI ML16200 and QSI 683 CCD's, I achieve image scales of 1.36 and 1.22 arcsec/px, respectively. It is my wish to achieve sub-seeing resolution on par with what I get with these cameras on my Celestron 11" scope, FL 2800mm. With that scope, these two cameras achieve 0.44 and 0.40 arcsec/px, respectively. I want to reproduce this capability with my refractor. (As an aside in case you are wondering, sub-seeing resolution allows me to better explore the possibilities of deconvolution and other processing steps.)
What camera would you recommend I consider for getting smaller resolution with the TS scope? Note that I am only interested in monochrome, cooled sensors.
I have no personal experience with CMOS cameras, although their pixel sizes seem to be a good match for what I wish to do. I've looked more closely at the ASI line of cameras because ASI has a filter wheel that can use my existing set of 31mm unmounted filters. The ASI183MM Pro and 1600MM Pro, for example, would achieve resolutions of 0.54 and 0.86 arcsec/px. The 183 would get me close to what I want. (Note that I am not interested at this time in paying for a more expensive camera such as the ASI8200MM Pro, and that one would also necessitate I purchase a new set of filters.)
Would the ASI 183 be a recommended camera for this purpose?
Some of the issues that concern me, however, are what effects will I encounter with this camera in comparison with my CCD experience. To what extent does 12-bit instead of 16-bit acquisition cause an issue? The dynamic ranges of both the 183 and 1600 look impressive, but does one truly get to use that range when in 12-bit? How bad of an issue is amp glow in the 183; to what extent does it affect calibration and processing?
Another question I have is the effect of Dawe's limit using this scope and camera combination. The TS 130/910 has a Dawe's limit of 0.89 arcsec, whereas my resolution would be 0.54 arcsec/px. I know this would present a problem were I interested in discerning binary stars, however to what extent is this an issue with DSO imaging? Does Dawe's limit present a physical limit to the effectiveness of camera resolution when imaging a galaxy as well as star separation? I note that with my larger pixel CCD's with the C11, the camera resolution is matched right at that scope's Dawe's limit. But, again, with the 183 on the TS 130/910, the resolution is about half of the scope's Dawe's limit.
Finally, I realize I've only looked so far into these particular ASI CMOS cameras. Are there other small pixel CMOS or perhaps small pixel CCD's that I ought to consider? If there are suitable CCD's (with suitable FW's that can take my 31mm filters), that might be an even better choice since I presently have no experience with CMOS cameras.
Thank you for your help with this decision, and I look forward to your responses.