Quote:
Originally Posted by jahnpahwa
Marc and any others, do you have any experience to share on which band pass is best for different targets? I'm realistically only interested in DSOs for now, though if the same pass works for planets and the moon that'd be fine too  I find it totally amazing that there are so many stars visible in IR and not in R. |
Ok here's the two filters I used; Baader L filter and Astronomik Pro Planet 742nm. You can see the LUM cuts sharply at ~700nm and the IR starts at 720 and peaks quickly at 740nm and onwards. So there is no overlap with these two. If you use a Sii that cuts off at ~680nm you can also do some cool blends. So once you have your channels you do L IR/L IR or IR IR/L L or replace the L by the Sii.
If you wanted to do pure IR you'd use NB IR filters at 750nm, 800nm, 850nm, 900nm etc... provided your camera QE is still high after 700nm. NIR NB filter can be quite expensive as well.