Really Right Stuff MPR-CL II Long Nodal Slide Clamp  type_Flash Coupling 2L II lens is a

2L II lens is a specialty short telephoto lens with a fast f1

Interior dimensions are approximately 15x20x30cm

please note that this is a manual focus lens

very wide on full frame

Really Right Stuff MPR-CL II Long Nodal Slide Clamp &nbsptype_Flash Coupling 2L II lens is aThe Really Right Stuff MPR CL II Long Nodal Slide Clamp is a roughly 18cm long Arca plate with a built in right angle clamp. Designed to locate the nodal point for panoramic photography, you could use this for all sorts of other wacky nonsense too. Not sure what, but I bet you could come up with something if you thought about it long enough. In excellent condition.