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That's interesting.
Nice work!
These are the specs for my scope:
Clear aperture........................... ...................254mm (10")
Focal length ................................... .............2500mm
Focal ratio (photographic speed) ................f/10
Resolving power ................................... .......0.45 arc sec
I wonder if coma gets worse the higher the F.
I think they are designed to give the best flat field at 6.3.
I kinda like the idea of F/5.32 or something faster than 6.3 so next outing, I'll redo some pics and then use the shorter Moonlite flange and put the FR back into the train at the sweet spot if possible and see how that looks. I'll do tests with the Hirsch one too. It could be months though before I get to the scope.
Cheers,
Damien.
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