The diopter frame allows 138 mm diopters of up to +2 to be used in a lightweight
matte box such as the ARRI LMB 4×5 or LMB-25. The frame has the width of two 4x
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 1/4 threads permit
the frame to be attached to an articulating arm. Note: Limited clearance with some
+2 Diopters.



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