The Arri 138mm diopter frame allows 138 mm diopters of up to +2 (Caution: Limited clearance with some +2 diopters) to be used in a lightweight matte box such as the ARRI LMB 4×5 or LMB-25.

The diopter 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 diopter frame during exchange, while two ¼” threads permit the frame to be attached to an articulating arm.

More information here.

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