A photographer simply has to mount the holder to an adapter attached to the lens, insert the filter into a slot, and lock the filter stopper. The Nikon gelatin filter holders accommodate gelatin or glass filters up to about 2mm thick. The AF-3 can be used with 3-inch square gelatin filters and Nikkor lenses having an attachment size of 52/62/67/72/77mm. The AF-4 can be used with 4-inch square gelatin filters and Nikkor lenses having an attachment size of 52/62/67/72/77/82/95mm.
Adapters having an attachment size of 52/62/67/72/77mm for the AF-3 and 52/62/67/72/77/82/95mm for the AF-4 are optionally available. The 67/95mm adapters are used for large-and medium-size lenses. The optional UR-4 58-62mm Filter Adapter Ring is for lenses having a 58mm attachment size.