The diopter frame allows 6 inch diopters of up to +1 and in combinations with the Diopter Adapter 6in to 138mm, up to +2 Diopter. The frame is compatible with the ARRI LMB 6x6, LMB-6 and SMB-1. The frame has the width of two 6.6x 6.6 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.