SIGMA Mount Converter MC-21 (Canon EF-L)

Use SIGMA Canon EF-mount lenses on L-Mount cameras

The SIGMA Mount Converter MC-21 EF-L is designed to let compatible SIGMA lenses with Canon EF mount be used on L-Mount camera bodies. It is a practical solution for productions that already own or rent EF-mount glass but want to work with cameras from the L-Mount ecosystem without replacing the entire lens set. SIGMA officially supports a range of L-Mount bodies, including selected Panasonic LUMIX S, Leica SL and SIGMA fp-series cameras.

The adapter can also be physically useful with other active L-Mount cinema cameras, such as the Blackmagic PYXIS 6K L-Mount. Because Blackmagic notes that autofocus performance may vary when lens adapters are used, the exact camera, lens and firmware combination should always be tested before a critical shoot.

Electronic communication and lens data

MC-21 maintains electronic communication with supported lenses and provides automatic aperture control as well as AF-S autofocus. SIGMA does not support AF-C continuous autofocus through this converter, which is important to consider for moving-subject work and video applications. For compatible lenses, the adapter uses pre-loaded lens data to optimize autofocus and aperture operation.

Lens information such as lens type, focal length and F-number can be written into EXIF metadata. The converter also supports selected in-camera correction functions, including peripheral illumination, chromatic aberration and distortion correction, depending on the camera and lens combination. A built-in LED indicates whether the attached lens is compatible and can also signal when a firmware update is available.

Designed for reliable production use

The inside of the converter barrel is flocked to reduce internal reflections and help preserve lens performance. A removable tripod socket provides an additional support point, which can be useful with larger lenses or rigged camera setups. The rental package also includes a carrying case for safer transport between locations.

For crews moving between EF and L-Mount systems, this compact adapter can simplify equipment planning and make existing SIGMA EF lenses more versatile. As with any electronic mount conversion, checking SIGMA’s current compatibility list is recommended when autofocus, stabilization or electronic controls are essential to the shoot.

Rent SIGMA Mount Converter MC-21 at CamCam Rental

At CamCam you can check current availability and reserve the adapter online together with L-Mount cameras, EF-mount lenses and rigging accessories. Our team can help verify whether a specific camera and lens combination is suitable for your production and suggest an alternative if you need maximum autofocus reliability. We also offer delivery and collection, optional on-set assistant support, after-hours returns, free parking and free equipment tests by arrangement. CamCam is open seven days a week, including weekends.