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Hi Carl,
perhaps consider a modded Toucam. It's a webcam modified for long exposure.
i've used it on a spotting scope (used as guide scope) for a while which had 540mm FL. and you can adjust the lenght of exposure to better capture some less bright guidestars. Most times I have used it at the fastest 1 second exposure and had bright guide stars to use.
I've sold the spotting scope and am moving up to a william Opics 80mm for a guidescope and I will be using the Touacm on that one as well
PM me if you want to discuss further
cheers
frank
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