Archived posting to the Leica Users Group, 2000/11/25
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Luggers,
For what it's worth, I use a lot of Kodak Gelatin filters. To be
specific, a CC30M to correct for flourscent lights.
They are VERY thin. I use them both ways either in front or behind the
lens. I have never noticed any image degradation with them. With my 16mm
Fish-Eye Elmarit-R, I had a ring made to mount a gelatin filter on the back
element.
As someone mentioned eariler, the biggest problem with gels is dirt and
fingerprints and the only fix is replacement when they get dirty.
As for glass filters, the Leica School taugh me when using filters try
to stop your lens down a little to cover any image degradation. They also
said the greatest image loss was with wide angle lenses, because of the
larger defraction angles of the light rays. The closer the light rays get to
perpendicular to the lens the less chance of defraction. In other words the
longer the lens the less loss.
Finally, didn't anyone read Irwin's post about the filter use.
To paraphrase, He found almost NO noticable difference. In other words,
this is a worthless topic.
Happy Snaps,
Sal