138mm Letterbox Diopter Strength:1 Two-year warranty against manufacturing defects

Two-year warranty against manufacturing defects

near-infrared light waves beginning at 680nm are blocked by approximately 45%

the effects of infrared pollution become more apparent

Shoulder Pad is an ergonomically designed pad that is made of thick foam rubber on a tough leather backing

The light from the sun naturally becomes partially polarized due to reflecting off electrons in air molecules

138mm Letterbox Diopter Strength:1 Two-year warranty against manufacturing defectsLetter 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.