1. Full body made of high quality metal material, durable to use. 2. High-tolerance precision craftsmanship, combine with the bayonet tight and smooth, like the original lens. 3. Full manual operation, manual focusing, manually adjust the light ring, manual exposure with the body, aperture priority exposure, infinity focus. 4. Removable, with a small tool, can adjust the lens scale. 5. This ring is used to connect the M42 lens to E-P1/ G1 and GH1-M4/3 mounts.
