I used to use Lee polyester filters in Calumet frames, both in front and
behind the lens. Since they are so thin, they cause a minimum focus
shift when used behind the lens, and this method has the advantage of
keeping stray light off of the filter. On the down side, I often
photograph around water, and I had problems with water droplets getting
on and marring the filters. These filters don't clean well. Clearly
this issue won't be a problem for some people.
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