[bojan]

Last week I obtained ASCAR C2 duo band filter, and tried it on NGC 1763..
There is plenty of G & B (as expected), but very little R...
My modded 60D has the first filter (with shaker) left in place, and I know it cuts IR quite sharply (compared to my modded 450D).
So I suspect this could be the reason for lack if R in my test image..

Does anybody have the similar experience? I tried to google some info on the subject (like response curves of 60D filters) but the results are scarce and inconclusive..