new eta

[alan meehan (Alan)]

took this shot last night ,sky was not real dark lots skyglow,24x3min shots using 100ed .8 w/o v111 focal reducer on 20d,theres coma i think on the outer edges not sure how to rid this ,all sugestions welcome please.this image has been trimed,thanks for looking.
AL

[h0ughy (David)]

hard to tell at the scale you posted Al, in photoshop change the image size to say 1024, then DO NOT SAVE - go to file save for web and then select jpeg on the right, adjust the percentage until the file size on the bottom left is less than 200kb AL

just close off the image and whatever you do - don't save it - you will ruin your original shot

[RB (Andrew)]

Al I'd love to see a larger version, like Houghy suggests, but I like what I see of the image so far !

[alan meehan (Alan)]

hope this is better

[sheeny (Al)]

Looks good, Al. I'd like to see if you can improve contrast a bit with levels and curves... the skyglow is a PITA isn't it?

Al.

[tornado33]

Howdy
Hope ya dont mind but I used Levels and Curves in photoshop also slightly increased colour saturation.

I have heard the Baader Coma Correctors (MPCC) help remove coma on refractors even though they are mainly designed for newtonian reflectors.
Tracking looks like its working well.
Scott

[h0ughy (David)]

Originally Posted by alan meehan

hope this is better

much better Al - we must find a way to get rid of that skyglow, though scott has had a repro

[AlexN]

I dont think you're suffering field curvature, That appears to me to be field rotation... How accurately were you polar aligned? The WO FF/FR 0.8x should virtually eliminate coma/curvature..

Shot looks great in any case!
well done.

[alan meehan (Alan)]

Thanks guys,Al i need more working on photoshop ,had ago tonight and has improved,alexn i think you might be right ,i spent heaps of time polar alighment but i agree looks like field rotation,although on phd guiding it was showing the best guiding i have seen .will have to recheck that one.
ALAN