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An unusual choice to image a galaxy with a 3nm Ha filter.
Be interesting to see a luminance image.
A fast astrograph is not really the right tool for galaxy imaging and your
16 inch aperture and F3.6 is better spent on something more widefield where it will show off its capabilities better. Something like Rho Ophiuchi or NGC6188.
The right tool for the right job. Also your PL11002 is a wide field imager at that focal length and a small chipped camera would get you some more magnification going.
To use your ASA 16 for a galaxy you probably need a Powermate 2 inch 4X or a Baader FFC or something to get extra focal length.
Stars look squared. Is that exaggerated by the 3nm Ha and less of a problem with usual luminance?
If not perhaps a different spider vein is needed one of those s shaped ones may be the go.
Greg.
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