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Magnetic ND systems
RevoRing paid a bunch of youtubers, but looks decent. Supporting a range of lens diameters without step-up rings is really convenient.
More recently, Maven did their own magnetic filter system. You pick a specific diameter unlike the RevoRing, but all the filters are color coded and texture coded for extra convenience.
I haven't found a single video comparing the RevoRing and Maven systems. Anyone have experience with either?