There's been an issue for some time with my filter wheel not postioning correctly and I'm trying to get SBIG to fix it. Difficult when you have to wait soooo long for photon time to flesh out the problems! The artifact in the UPPER R/H corner is what it does and I've just been cropping in the past as with my other ~80mm scopes the image field not always great in the corners anyway.
Tonight I'll try and get more subs.
here is a link to a larger higher resolution version.
14 -900 second Ha. SBIG8300M, Baader 7nm Ha filter (I think the 5nm Astrodon arrives tomorrow!) This might be my last image with 7nm Ha filter. FSQ85 on mach1 with SSAG miniguider, processed in MaxImDLpro, CS5, and PSP.