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Thanks one and all for the replies
Sounds like I should avoid the f4 astrographs and stick with f5's reflectors
I assume you then need a coma corrector for the f5 in any case for the DSLR
I have no problem achieving focus with my DSLR on the 6" f6
When I use various powermates for planetary and DSO imaging with my DSLR I have to use a 35mm and 50mm extension adaptor to achieve focus
Not taking cost into consideration would the Televue parracor type 2 have the edge over the Skywatcher f5 coma corrector both for visual and Astrophotography use with respect to quality of view and images
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