Quote:
Originally Posted by mithrandir
GSO+Canon - 0.66 arcsec per pixel (ASP).
Miniguide+SSAG - 6.7 ASP
6.7/0.66=10.15
That's about the edge of the envelope. You should look for a ratio under 10. If it was a mono chip instead of a DSLR you could bin it 2x2 which would help a lot.
If the PHD graph (measure in ASP) is bumpy you need to improve the mount alignment. You didn't say what the mount was. That could be important too.
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Thanks for the guidescope to imager info Andrew - the mount is an EQ6 on a new pier - Cheers.