CPM20 Mattebox?

Ive looked at this before... it jas a cokin filter holder and lense hood with the sunshade built onto that. I think you could possibly add another stage prior to the matte box with a rotating section, check your cokin dealer to confirm ... looks like its bpw700 filter holder on a p255 lense hood. The step up ring for 72mm is a p472 (sorry had my cokin catalog in front of me). The mid section you would need is a p308. But as I said check with a cokin dealer.

Also with all that before the sunshade vignetting is a high possibility.
 
Man, that thing is fugly. Description says that the rear stage rotates, though I cannot discern how this is done in any of the pictures.

Rotating stage is crucial for sure.

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it is built on a cokin P system, which uses 84mm filters. There is one slot the allows the use of the circular cokin P polarizer. The stage doesnt rotate, the circular filter just spins in the slot (you cannot rotate any of the square filters)
 
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