cameraworks-uk M10/M11 eyepiece thread adapter. This adapter is supplied with a special stainless steel key for safely mounting the adapter to your camera. Once fitted, this adapter allows the use of your eyepiece correction diopters, accessories such as angle finders and eyepiece magnifiers that were made for earlier cameras. Precision machined from quality materials and supplied in a convenient storage case. Note: diopter/magnifier/camera not included.