Another test with my new filter, UHC. The sensor temperature cause loose in quality. It was around 42 degrees Celsius.
Also, it seems that the UHC filter isn't liking my coma corrector, or vice versa. I am seeing more coma at right side of photo (left side of sensor).
Actually, I don't know if the temperature is the main issue of noise. I have similar problem with my H alfa filter.
GSO 305 mm - Canon T3 - 11 x 4 min (44 min) - ISO 800 - OAG - Filtro UHC - Coma corrector
The files of images have more than 200 kb. So, you must see them at:
http://jsmastronomy.30143.n7.nabble....d242.html#a379
Or with best view in full resolution mode at:
http://www.astrobin.com/156400/