ASTRO: M97 with Skywatcher ED120

I got myself a Skywatcher ED120 as a wide field scope recently. This is
"second" light ("first light" was such an incredibly cold night that mount,
scope and operator were not functioning correctly) in a very bright night
with city lights, bright moon and a snow cover that reflected both. Sky
background in a 10 minute exposure at f/7.5 was over 5000 counts though my
Astronomik 13nm OIII filter. In a "normal" city night this would be below
1000.
The ED120 gives good starshapes in Halpha, OIII and also broadband. This
image is not sharpened in any way.

Taken from the middle of Berlin with a Skywatcher ED120 at f/7.5 on a G11
mount, SXV-H9 camera, 14x10 minutes Halpha, 6x10 minutes OIII.

The picture can also be found at
http://ccd-astronomy.de/temp2/M97colourgut.jpg

Stefan