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Say Goodbye to Step Up Rings – Alter Rapid Filter System Takes an Old Trick and Makes Something New
David J. Crewe,
5 years ago
5 min read
The Rapid Filter System (RFS) lets you engage and disengage lens filters the moment you need them. It attaches via the universal filter threads your lens has, and then you can screw a ND or CPL filter on to it.
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