G GarageBoy Flashlight Enthusiast Joined Jun 12, 2004 Messages 3,977 Location Brooklyn NY Oct 1, 2007 #1 Why are the FMxx mirror coated as opposed to the other filters? Thanks
Size15's Flashaholic Joined Aug 29, 2000 Messages 18,415 Location Kettering, England Oct 1, 2007 #2 To maximise the light transmissivity at the desired wavelength.