Well, I don't think the web is very good at illustrating such distinctions, and if I ever did save behind-filter examples, it would be somewhere on the bottom of a reject pile of negatives. The tests were done with top-notch G-Claron and Fuji A lenses. The difference wouldn't be objectionable on an 11X14 print from 4x5, but would be obvious in a bigger print or certainly under a loupe. I take very good care of my Wratten gels as well as glass filters.
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