View Single Post
  #17  
Old 22-09-2008, 11:01 AM
Peter Ward's Avatar
Peter Ward
Galaxy hitchhiking guide

Peter Ward is offline
 
Join Date: Dec 2007
Location: The Shire
Posts: 8,454
Of course, sometimes the bleedin' obvious passes me by.....what colour is
H-Alpha even if you don't have easy access to a solar scope?

Simple!

Just grab a the narrow band H-Alpha filter you are using to image with, and look at a bright white light through it (duh)

Pretty deep red eh?

P.S.
10nm pass filters don't look quite so deep as they obviously pass a little 645nm light...as opposed to 3nm pass versions....they are very crimson.
Reply With Quote