Darrell, all of those are video cameras and are more suited to planetary imaging. The Orion is the only cooled one there and it's sensor isn't small, it's tiny. Even the online blurb for the orion points out that it makes a great guide camera. If they aren't cooled they'll be noisey in long exposures. I bought a 2nd hand DSI as a first camera and got some nice moon shots out of it, but it became a guide camera for a DSLR within 6 months
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However some people seem to get great images out of the DSI.
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