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Ah! Thanks 1p, that clarified that issue for me.
So a SM40 on a 80mm won't really be much advantage (if any) over a PST (esp DS). Just can get higher mag but with an object this close and this huge that is a minor issue, I think.
Also is the visual image much dimmer with DS than single? Is it a bit too dim?
The shop I am ordering from suggested the 2nd filter won't help, due to dimmness, unless imaging - which I intemd to do anyway.
Also do you have a solution for the issue of using a cam in the PST (re: back focus)?
Craig
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