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"Long exposure problem"
I had a problem with some long exposure photos of a beach in sunlight. The overall exposure is fine, but the clear sky turned out very uneven, from very dark blue to almost white.D700, 16-35mm, ISO 100 (low-1), F/22, 8 seconds. Singh-Ray Var-ND-Duo set to block 8 stops.Any idea what caused this? I have a whole bunch of photos from the same shoot with the same problem, so the problem is consistent.I'm guessing it may be the Var-ND-Duo and the way it's mechanism variably blocks light, but before I go spending money on one of their new 10-stop filters, I'd like to be sure.Thanks!!!