The diopter frame allows 138 mm diopters of up to +2 to be used in a lightweight matte box...
The diopter frame allows 138 mm diopters of up to +2 to be used in a lightweight matte box such as the ARRI LMB-25. The frame has the width of two 4 x 5.65 filter frames and fits into a 2- or 3-filter stage. A safety mechanism prevents the diopter from falling out of the frame during exchange, while two ? threads permit the frame to be attached to an articulating arm
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