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I often take photographs while I'm polar aligning. During that time there's 5 minute periods where the scope is just tracking with me not moving it (and no autoguider moving it), so I figure I may as well. They often turn out perfect.
I also often do wide field shots later on at night without autoguiding, again, no problem.
All of them using my 17-40mm lens, so somewhere in that range, not all wide open at 17.
Providing your polar alignment is vaguely OK, and RA tracking good, you shouldn't have much of a problem for exposures up to 5 mins I'd think.
I sometimes decide to do this because autoguiding is just too hard... I just put the camera on the back and take the shots. There's no doubt it's simpler. Sometimes the PC isn't behaving or the autoguiding isn't behaving too.
Roger.
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