Originally Posted by
Eric Woodbury
I don't know what you photograph, but if it includes open sky, you will find that the sky's polarization changes dramatically with angle from the sun. This with a polarizer will give a great variable sky tonality. I have a 4" polarizer from Calumet, but would never use it with my 72mm on 5x7.
That said, you may not need as large a diameter polarizer as you think. As you stop down on the lens, you are using less and less of the diameter of the lens. That extra diameter is there for that fastest f/number and ease of focusing. Chances are you stop down for your exposures and much of the diameter of filters that 'match' your lens goes unused.
YMMV.
Happy snapping.
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