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Durable and comfortable
Sharpness continues to be consistent
Wai Karāhe Ma
Eliminates Buying Many ND Filters
138mm Letterbox Diopter Glimmerglass Durable and comfortableLetter Box Diopters are considered the reverse of the Strip Diopters. An open slot in the center (similar to a slot in a mail letter box) is flanked by diopter glass on either side. These diopters allow you to create interesting effects while experimenting and allow you to achieve varied focus, diffusion and double imaging effects. They come in 15mm and 30mm formats.
