[Robert]

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One picks the best optical glass filter to place in front of the taking lens and then a fairly cheap plastic/gelatin one to place in front of the enlarging lens?
Well, then an el cheapo enlerger lens would be OK, why a top Nikkor, Schneider, Rodagon?

I always thought that gel filters are actually better then glass filters in terms of optical quality. Kodak 3"x3" filters aren't exactly cheap either. They seem cheaper then the high end glass filters but how long will one last? Glass filters seem to last almost forever.