Thank you very much, Raymo.
As I did some frames with skyglow filter I tried to add the UHC result data over stacked skyglow. The mix result is:
http://www.astrobin.com/156720/
GSO 305 mm - Canon T3 - ISO 800 - OAG - Coma corrector
UHC - 11 x 4 min (44 min)
Skyglow - 8 x 4 mn (32 min)
Total: 1 h 16 min
The photos have big file size, sorry ! You can see the photos at:
http://astronomia-e-astrofotos.10697...13-wide-k9.jpg
http://astronomia-e-astrofotos.10697...-detail-k9.jpg
note: the skyglow frames have less noise than UHC, but unhappily I lost some ones because of bad focus. The sensor temperature was around 40 degrees Celsius.