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Re: Filter placement?
An easier way to do it is to buy square filters, and then stick those to the very outside of the lens using something sticky, like blue tack. I use this for sunset, ND filters, ND grades, etc. on my Mamiya 37mm fisheye (medium format) - which is about 4" across.
This technique also works for stacking filters, as stacking round filters (or square in say a Cokin mount) can cause vignetting fairly quickly. Stack square filters by using blue tack to get much more consistent results
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