Choose your adapterring for the mattebox series
(* When using the MB-325 or MB-350, and the second filter has to be rotated, a 4,5"X4,5" filter and filterframe is required. A 4"x4" filter will fignet slightly) (** This lens only works with 1 non rotating 4”x4” filter frame or 2 non rotating horizontal 4”x5.65” filter frames)