Hi, I'm considering a purchase of a 90mm lens for my 4x5. I understand that with so me wide angle lens there is sufficient light fall off at the edges that a specia l filter is used to correct for this. Does a 90 mm need such a thing or does it depend on the image circle such that a SW 90 mm would need one and a regular 90m m would not. Thanks for you input.
Keith
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