This adapter is made of anodized light alloy (it's weight is only 20gr). It allows to mount T-lenses (m42x0.75mm, 55mm flange focal distance) onto PL-mounted camera like Arriflex.
We made two index cut-outs on the mount to allow install it either for an operator convenience (lens index mark at the top left position), or for an assistant convenience (lens index mark at the top right position).
Longer FFD of the T-mount allowed to lift T flange over PL flange plane, so you should have no problems with mounting T-lenses onto a camera.
This product was added to our catalog on Tuesday 19 August, 2008.