Hi all,
I've searched high and low (no pun intended) for an answer to this question: at what elevation/altitude are longpass (as opposed to skylight) UV filters useful? I'm talking about a Wratten 2A or 2B versus a 1A (or the respective equivalents for other manufacturers) . Like, is 5,000 ft/1500 m high altitude? 8,000 ft/2500 m? 12,000 ft/3,700 m?
I primarily shoot Ilford FP4 on 4x5 at the moment, and would like to do some photos on Mt Rainier around the 8,000-10,000 ft/2,500-3,000 m elevation range. I was contemplating adding a Formatt-Hitech 400nm filter to my kit for this purpose. Any thoughts? I'd put this filter behind a circular polarizer, a 15 or a 24, and possibly a GND.
Thanks!
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