Actually, the EF-M filter size is very uniform - 43mm, 52mm, and 55mm. Primes are all 43mm, 11-22 and 18-150 are both 55mm.Canon takes some weird decisions occasionally. The LP-E12/E17 is one of them. The other is focusing on compactness and portability for the M system and yet they make every single lens with different filter size so one has to carry 2-3 different filters.
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