Shawn and other interested:
I use the Cokin "P" system and only get a very small amount of
vignetting at the corners on my 21mm lens when using the graduated ND
filters. I think you need a series of ND gradients, no one amount of ND
will fit all situations. Hopefully others will respond who have used
other filter systems which cause no vignetting.
shelley stallings in alaska
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