I'll have to remember to try that next time. I can increase the ISO a bit, but it starts getting noisy. I think I'm already maxxed out with the exposure time at 1/60 sec. With the 60D in 640x480 crop mode, frames per second is set at 60fps. If I took it out of NTSC mode it would be 50fps and I might be able to increase exposure time to 1/50 sec. I've been shooting all the planets (except Venus) at 1/60 sec exposure time, and just varying the ISO. Venus is too bright at the lowest gain setting of 200 with exp at 1/60, so for Venus I've been shortening the exp time to 1/400 sec.
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