Solomark Telescope/spotting Scope Accessories T-ring for Sony-NEX Camera Precision machined T2 adaptor ring for all Sony NEX compact system cameras Compatible with:Sony NEX E-mount camera (NEX-7 NEX-6 NEX-5 NEX-5C NEX-5N NEX-5R NEX-5T NEX-3 NEX-C3 NEX-F3 NEX-3N). With T-ring, you can use M42 Lenses on Sony NEX E mount camera. Inner ring can be rotated with a standard allen key (allen key not provided) to ensure lens is always right way up Superior quality, top class precise design. All metal construction and anodizing aluminium process, durable for long time use