I discovered a couple of weeks ago that the "Ha" filter in my camera was in fact the S11 filter (they look sooo much alike - the Ha filter when held up to a torch light or bright light is a similar shade of red but much lighter).
No wonder the 7:15 hours of "Ha" turned out relatively dim.
So I shot 1:50 hours of Ha the other night and it was fine.
So I have added this to my Horsehead image. It must be the only one around that has over 7 hours of S11 data in it!
I plan on taking even more clear and RGB data on this next trip to top it off as I have invested over 17 hours of exposure time in this one now.
http://www.pbase.com/gregbradley/image/109538475
TEC180 fluorite, FLI Microline 8300, Baader clear filter, Astronomik RGB, Astrodon Ha, S11 5nm filters, Tak NJP mount.
Greg.