I am a Solar Imager, you may have seen some of my stuff, I also do Lunar. I find Solar extremely easy and use a ZWO ASI174mm (not cooled)
I originally purchased a ASI120MC before realizing it wouldn't work for solar as it is color. I also have a ASI120mm-s for solar. I have started to do some deep sky stuff, not much due to the reason I am into solar, my light pollution where I live, skies are usually worse than mag 2.4 and need averted vision to see Polaris which is over the shopping mall 300 feet from my location.
I drive to the Seagrave Observatory in RI to do imaging where they are about 4.5
I have been using my Canon 70D and now my 80D with Backyard EOS and that is easy, although not cooled, 8 months of the year it really doesn't matter the temps at night are in the 40's and 50's F and much colder also.
I was thinking of getting a cooled ASI camera and was thinking of a color camera for the one shot ease, but having the 120mm and the 174mm was also wondering about a filter wheel for them. They would handle most of the Messier's and the 80D would handle the big stuff like M31.
A few questions,
1) First a filter wheel, If I thought that a 120 minute exposure (total for stacking) would give me what I needed, with the filter wheel is it 120 minutes for each color and the clear so 480 minutes, or the 120 divided by the number of filters, so 30 minutes each?
2) Would a cooled camera make a big difference especially in the summer time where temps at night can be in the high 60's F.?
3) I may be getting a cooled ASI174mm for solar in the summer, have to see how bad the noise is when it gets in the 90's and the camera temp climbs to over 50C. If I did that then a filter wheel might be the way to so since I am 90% a solar imager but the question is exposure - see question 1, I don't have hours to spend getting captures I have to work my day job.
4) if I decided on a ASI1600 or ASI071, would they give better results than the 70/80D Canon cameras or be comparable except I could get them cooled?
Most bank for the buck might be a ASI174mm with a filter wheel, useful for my solar and for DS but worry about exposure times with a filter wheel
Responses are appreciated