This adapter allows use of LTM lenses (39mm Leica mount thread) on the Sony NEX mount digital cameras. This application became quite popular lately, it gives digital shooters a chance to produce classic-looking and eye-pleasing images.
The adapter is well made, all metal construction. It has a nice design feature - the inner part which accommodates the lens has three set screws. When the lens is installed, it can be oriented in the correct position, with the dials facing up, by loosening these set screws and turning the inner part. A small screwdriver is needed for the job.
The Sony NEX5 picture here is courtesy of Vlad Kern. The other two pictures show the micro 4/3 adapter which has the same design.
The Jupiter-3, Jupiter-9, FED 50/2, Sony NEX5 and Olympus E-P2 are shown for illustration only and are not included.