I finally got my Varilock variable spacer well adjusted & managed
to get over 2 hours of 10 minute subframes of LRGB.
I used a 2" Astronomik CLS-CCD filter as this was from my light polluted driveway.
For the first time I actually got FWHM values of around 2.6
across nearly all the entire frames instead of the other night of 5.8 -
I checked each sub frame as I was shooting using Maxim DL.
It would have been good to collect more data to reduce noise.
I also took 3 x 2 minute subframes of RGB - as the small wells of the
QHY9 filled up quickly on the bright stars & I wanted to get star colors.
I copied the stack of bright stars into this photo from the 2 minute sub frames.
There is still a gradient problem so I may re-process but I am pretty happy with the result.
Taken with an f6 8" Newt.
A larger 1600 pixel version is here:
http://www.flickr.com/photos/2471943...n/photostream/