The Sigma MC-21 allows SIGMA’s CANON EF mount interchangeable lens owners to use their lens investment on L-Mount camera bodies. The converter allows more freedom of choice for L-Mount cameras, enhancing the extensibility of the L-Mount system.
Lens data is pre-loaded - Running the data pre-loaded in the MC-21 for each lens by the special control program, autofocus and aperture control have been optimized. Regarding lenses to be released in the future, data for operating these lenses via the MC-21 will be stored in the lens. It means no firmware updates of the MC-21 will be required to use those new lenses. In addition, the MC-21 also supports correction functions of camera such as peripheral illumination, chromatic aberration of magnification, and distortion.
Fast and accurate auto focus - High precision AF photography in AF-S mode is achieved. Note: Not compatible with AF-C mode.
Inclusion in Exif data - Information such as lens type, focal length, F number, and other tags are embedded as Exif data in each image file.