Quote:
Originally Posted by JA
...Were the same exposure settings used for all images?
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Yes, but I started soon after sunset so there was still a bit of sky glow, sorry :-)
Also there was a bit of wind from time to time so this could also contributed to stars diameter, along with focus.. which was different between C and M.
As to sweet spot.. Celestron FR didn't show much difference between 85 and 115 mm back focus (comparison attached below).. I was considering buying the adjustable focuser, but decided to try with fixed tubes first.
I will do some more work on the next opportunity, this time I had to stop because of clouds rolled in (when I closed the ROR they went away).