ASTRO: Pickering's Triangular Wisp

I have been imaging the eastern part of the Cirrus nebula in 2010
(http://ccd-astronomy.de/temp4/6992coloursmallneugut.jpg) and the western
part in 2012 (http://ccd-astronomy.de/temp7/6960coloursmallgut.jpg) with my
Skywatcher ED 120. This year I went for the middle part, known as
"Pickering's Triangular Wisp".
This time I used my 80/480mm TS triplet APO with a 3" flattener. The
slightly larger stars to the upper right are not caused by the telescope but
by my imaging train. Probably the CCD chip does not sit square, I have had
problems with the upper right in the past with other scopes.

Taken from the middle of Berlin with a 80/480 triplet APO on a H-EQ5 Synscan
mount, Atik 383L+ camera, Baader filters, 11x20m Ha, 10x20m OIII, 4x2m RGB
each.

Small version:
http://www.astronomicum.de/modules/Gallery/data/media/4/PickeringForum_2.jpg
Large version:
http://ccd-astronomy.de/temp8/Pickeringcolourgut.jpg

Stefan