Jac, where on earth would one even find a "K2" filter these days unless they uncovered some Egyptian tomb beneath the dunes? Even that numbering system predates Egyptian hieroglyphics, I think. My point is, if someone does manage to find something like that, and does have the time to scrape the
layers of mold and snail tracks off it, it's certainly not going to help the optical expectations associated with an expensive lens. And Tom - yes, UV filters
can help clear a tad of haze scattering even on the coast using color film, but will be nowhere near as effective as a red or deep orange filter for pan film
in that respect, which allow only long wavelengths through. And one shoe does not fit all in terms of the best filter for each specific type of color film.
For example, I found that a nearly colorless very light yellow UV filter worked best for E100G chrome film at high altitude, whereas a pale magenta 2B
worked best with Fujichrome, and a Singh-Ray KN pale apricot-salmon UV filter for Ektar color neg film. But even some of these product numbers have
since changed to match the digital rather than film camera market. Ironically, certain kinds of expensive multi-coating can be counterproductive with
certain digital sensors. Glad I don't have that problem; but I do believe in high-quality coated glass filters rather than flimsy fragile gels.
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