rnabholz wrote:Gekko, no worries about the new line of discussion. This thread has covered a lot of ground, all of it, including green filters, is interesting. Go for it!
Rod
If I may for what it's worth, I would like to add that I just got the Lee #124 filter recommended by zzffnn, and I compared it with the Nikon GIF interference filter using my inexpensive hand spectroscope. Here is what I got (but this is my approximate impression, and the numbers give only a rough idea):
LED light source spectrum: 440 nm to 680 nm
Lee #124: 485 nm to 650 nm
Nikon GIF: 490 nm to 630 nm
So they both have quite a wide passband from blue up to and including orange and red. They probably attenuate the blue and red but I cannot tell visually by how much. They do cut off the extremes of the spectrum, but I expected the GIF to have a very narrow passband centered around 540 nm or so, and I was rather skeptical that the Lee gelatin filter would be any better and in fact it appears to have a slightly wider passband than the GIF.