Square ND filter mount

Jul 13, 2012
Bukit Batok
Hi, I am thinking of getting the Square ND filters to use on my E-M1. I read that it's more flexible to get the square ones since can use on most lens instead of a fixed diameter. Anyway, Since M43 lens aren't that wide, is it too wasteful to get the 100mm filters + mount? I read that there is a P series which is 84mm wide. That should be more than enuf rite? Also, Hitech has a square 10 stop ND filter but its 85mm. Does it mean can't fit on a 84mm mount?
Pardon me if all these sounded silly, I did some search but can't find the exact answer on the forum.
Last but not least, any recommendations for places to buy it?

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