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Agreed that a small cylinder body camera would be ideal. One of the ASI cooled models maybe. Have you considered a simpler (and lower cost) solution, like a Hyperstar equipped SCT? I have been looking at the cost of the Hyperstar lense element for my Edge HD8. The Hyperstar system can provide a front filter drawer do that you can use mono cameras for RGB or narrowband. You could certainly shoot narrowband from your place. I would avoid DSLRs because of the central obstruction effects mentioned. The Hyperstar system also provides field correction, so standard SCTs can be used.
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