In three weeks we'll be heading to Yosemite. My first visit to a national park. I'll be shooting color neg and pos. I have standard UV (0) filters, that I only use when shooting at the beach or in very dusty locations.
The valley is about 4000 ft, and we won't be much higher, since most of the high trails will still be snow-bound. At that altitude should I use a 2B filter to completely attenuate the UV, or is there not enough to have a noticable effect?
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