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Old 28-08-2016, 12:51 AM
glend (Glen)
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glend is offline
 
Join Date: Jun 2013
Posts: 5,284
It depends on the camera and the f ratio, in my option. I shoot all my narrowband at 300" with the ASI1600MM-C. All my scopes are f5 to 5.3. I have Gain and Offset control on this camera and use what is becoming a standard, of Gain 139 and Offset 20.
Shorter subs just shoot more of them. In my testing there was very little noticable difference between 20 x 300" subs and 10 x 600". As you suggest sky conditions are a factor.
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