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Paul
The next question is what do you want to image ?
Moon and Planets
Or
Deep Sky objects ( clusters , galaxies , Nebula etc )
The ASI1533 ISC Camera maybe more suited for planetary imaging at only 9 megapixel and it has a very small sensor size
If you want to image DSO’s the following cameras maybe more suitable -
ASI1294MC sensor size 19mm x 13mm Resolution 11.7 megapixel Pixel size 4.63uM
ASI 071MC sensor size 23mm x 15mm Resolution 16 megapixel Pixel size 4.78uM
Both these cameras will achieve sampling rates of around 0.90 arc sec per pixel at your focal length of 1000mm ie: slightly over sampled
The ASI183MC is another option but at a pixel size of only 2.4uM you would be way over sampled at your focal length of 1000mm ( not a wise option, more suited to a shorter focal length telescope )
Choices , choices but in the end it’s what you can afford
In the end for DSO imaging some of the specs to look for is a pixel size to get you slightly over sampled for your focal length 0.80 to 1.20 arc sec per pixel , medium to large size sensor , high ADC bit say 14bit or 16bit and a high QE 80% or higher
Hope some others can chime in who know a lot more than me about dedicated Astro cooled OSC cameras
Good Luck
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