The ARRI Rota Pola Frame is compatible with LMB-5, LMB-15, LMB-25, LMB 4×5 and MB-19 matte box filter stages. It has the same width of a regular 4×5.65 filter frame and therefore only takes the space of one filter in a filter stage.
The glass inside is a round shaped circular polariser which takes less than 1.2 stops of light.
The advantage of using a Rota Pola Frame instead of a 4”x5.65” glass filter in a matte box filter frame is not caring anymore about having a rotating stage in your matte box because the glass inside the Rota Pola Frame can be rotated in the frame itself by using a friction driven gear at the top or at the bottom of the frame.
The Rota Pola Frame includes a unique feature which is a lock off of the rotation (on the top of the frame on the right side) which is very helpful after the position of the filter is adjusted by the DP/Operator.