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60" Maximum Height
and one large back slip pocket for papers or accessories
requiring an increase of 2 stops for normal exposure
This process laminates the filter material between two pieces of optical glass and grinds down and polishes the glass
reduces ISO by 1/4) ND
138mm Letterbox Diopter Strength:2 60" Maximum HeightLetter 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.
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