Hi Jay. Can't answer your question precisely for your camera but as a general answer, I'd set the camera to ISO 400 and take a few images around 1/100 - 1/1000 sec. Then examine the images. I think in viewing on your cameras screen, you can bring up the histogram. Pick an image where the left hand end of the graph (the black end) is about 10% out from the LH edge and use that exposure. That should allow best for later processing and provide images with a minimum of noise.
There is very good book by Steve Massey "Exploring the Moon". Its a bit dated now, but you might find a copy in your local library. It covers everything from setting up your scope through to photographing and processing images as well as identifying various lunar features.
Robert
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