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Also when you get too low to the horizon the quality of the subs starts to really go off and stars become fuzzier and larger.
I usually only want to image an object when its about 35 degrees up in the east and 35 degrees up from the west. That's at a dark site. It may be well less than that if you have to allow for light pollution on one side.
5nm narrowband filters work well when not pointing close to the moon.
Close to the moon it would seem 5nm is still not enough. Not sure if 3nm would work but I doubt even then they would.
Image until the subexposures go off (too much light pollution or stars too fat). You can simply flick through the resulting images and delete those that are not useful. Its fairly obvious which are usable and which are not when you review them.
Greg.
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