Product introduction: Currently, M4/3 adapters can be used with almost all lenses. There are as many as 9 types of M4/3 adapters that have arrived (cine lenses, PK, L, R, EOS, CY, FD, AI, MD, M42, etc. ), are still being introduced, making old lenses regain their luster digitally. The M4/3 adapter does not require any additional corrective lenses and can focus at infinity, thus retaining the original imaging effect of the original lens. Moreover, since M4/3 only takes the imaging range of the middle 1/2 of the entire lens, That is, the most ideal part for imaging, which can bring out the best performance of the lens. This adapter is used to transition screw mount L39 lenses to Olympus E-P1 / Panasonic G1, GH1--M4/3 mount bodies. Name: L39-M4/3 Lens Conversion Ring Type A Material: all metal, durable Workmanship: The workmanship is very exquisite, and it is tightly and smoothly integrated with the bayonet, just like the original lens. Functions: Full manual operation, manual focus, manual aperture adjustment, manual exposure with the camera body, aperture priority exposure, and infinity focus.