Unfortunately, this matte is a bad design ... Normally, the diaphragm valves for the transport must be collapsible. The point of this model is not, unfortunately, because the brackets are attached to the wrong place (why ???). Thus, the diaphragm valves must be removed every time, which is cumbersome when not very stable holders and always brings with it the risk that holders cancel (how to listen, that's already happened several times). Had thought when Kostruktion the Matte Box little more and the brackets for the doors mounted practically, this would be a very decent product; especially for the price. For the conversion of a second and third DSLR camera to video requirements this Mattebox would otherwise actually ideal. And for lenses with 77mm filter diameter, the matte box fits not really ...
