I'm about to buy a Meike 8mm Cine Lens for my BMPCC 4k (which has a 2.0x crop factor) in the M43 mount variant. The filter thread size is 86mm, but my only Pro-Mist and ND filter thread sizes work with 82mm.
If I use a step-down ring, how noticeable will the vignetting be? Or there will be none?