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The ZWO585MC is a planetary camera and not suitable for DSO imaging in your 8” newt
Some cooled OSC cameras suitable for your 8” Newt for DSO imaging are -
ZWOASI171MC
ZWOASI533MC
ZWOASI294MC
ZWOASI2600MC which I use in my 6” , 8” and 10 newts
Or alternative in QHY brand
The above cameras will work with most acquisition and capture software Sharpcap , APT , SGP and so on ……..
For selection of camera for your telescope you should calculate FOV and Image Scale for your proposed set up ( refer to “Astronomy Tools” to calculate FOV and image scale )
FOV refers to framing the object you want to capture in the field of view
Image scale refers to sampling ( ideally you should be between 0.60 to 1.20 arc sec per pixel or “oversampled” to take advantage of Binning )
Then there’s filters for Narrowband imaging
I strongly recommend you look into guiding ( PHD2 ) at some stage , it’s not that expensive or difficult to set up and do. You will soon get frustrated with short exposures especially if your located under darker skies ( outside City /suburban areas ) All you need is a guide camera , guide scope and cable , PHD2 is free software
Improving or tightening your polar alignment down to 1 arc min will only allow 50 or 60 sec max exposures with that 8” newt depending on your mount ?
If you have a tight budget then opt for a second hand Canon or Nikon DSLR camera with an APS C sized sensor ( not full frame ) for your 8” newt.I used a Canon 600D for 3 years
Capture software like BYEOS , BYNIKON or APT for DSLR’s are excellent
Hope the above is helpful
Cheers
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