MAGNETIC Freewell Filters
The Freewell magnetic filter system is a great convenience for those who change filters often, and unlike many other filter systems, even solves the lens cap problem!
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Hardware: Alter Rapid FIlter System (RFS)
The Alter Rapid Filter System (RFS & RFS+) provides a way to easily and safely move a filter out of the way temporarily while shooting.
LAST CHANCE! Alter RFS Rapid Filter System
Annoyed at having to remove your ND, polarizer, or any other filter for just a few shots, only to replace it a moment later? Then you'll like the Alter RFS!