Thread: two 6nm Ha filters together
View Single Post
  #3  
Old 29-07-2009, 03:41 PM
allan gould's Avatar
allan gould
Registered User

allan gould is offline 		 
Join Date: May 2005
Location: Brisbane
Posts: 4,485
Whatever the band pass percentage of light is with one filter at Ha wavelength ie 50%, then with two filters it will be 50% of 50% ie 25%. No advantage what so ever in stacking them
Reply With Quote