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A lot of this theory is tempered by the reality of imaging.
Clouds, light pollution, poor tracking, bad autoguider performance, flexure, lack of clear nights, lack of time due to work.
So you tend to end up with some sort of subexposure length that optimises both performance of the camera and performance of your tracking in your setup.
Also 40 minute subs sound great if you have the tracking and weather for it. The occasional fast cloud would mean 40 minute subs are unwise.
Poor tracking would make it impractical anyway.
Another factor is the well depth of the camera. These smaller pixel cameras have small well depth and that is one of their weaknesses.
So bright stars can bloat in fast system in long exposures doing LRGB.
So well depth is another factor to consider. Its not really an issue if you are doing narrowband. Shorter exposures on bright objects using a camera with a shallow well depth is the strategy to prevent bloat of bright stars or losing star colours.
Greg.
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