This is one of my few images of the past months. It's a 10:10:15 minute
exposure with an STL-1301E thru an OGS 20-inch RC Cass working at around
F/5. This image was taken at nearly full moon, so I suspect that is the
cause of the weird blue corners - i.e., bright sky vignetting that was not
completely processed out. The focal reducer lens was never intended for this
use.

For more info on the Crescent, see:
http://www.kopernik.org/images/archive/n6888.htm

George N