Canon 52GFHWII Drop-in Gelatin Filter Ho - 52mm Drop-in Gelatin Filter Holder 52 (WII) These glass-backed holders accept up to three commercially available cut-to-size gelatin filters for rear-insertion lenses. For your EF 200mm f/2L IS USM, EF 300mm f/2.8L IS USM, EF300mm f/2.8L IS II USM, EF 400mm f/2.8L IS II USM, EF 400mm f/2.8L IS USM, EF 400mm f/4 DO IS USM, EF 500mm f/4L IS USM, ...
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