A new converter that increases
the expandability of the L-Mount

SIGMA MOUNT CONVERTER MC-31 is a converter that allows PL mount lenses to be used on L-Mount cameras.
By using SIGMA MOUNT CONVERTER MC-31, users can use PL mount cine lenses, which are widely used in the filmmaking industry, on the SIGMA fp and other L-Mount cameras.


Shim adjustments

MC-31 has shim adjustments on two points of the mount. Adjustments can be made with a shim kit (Supplied) on the camera side of the mount2,or a shim for ARRI digital cameras on the lens side1.

All-metal construction for excellent durability

With an aluminum-alloy body4and strong brass mount and locking ring5,MC-31 boasts excellent durability.
It is also designed to be secured on the mount of the SIGMA fp with a screw thread3,ensuring an even more secure connection between the lens and the camera. This allows users to shoot steady without the lens rattling even after the long-term use.

Support foot

The removable support foot6allows MC-31 to be attached to a tripod or other filmmaking accessories such as a camera cage.

Suitable for various shooting conditions

With the screw thread removed, the stopper of the locking ring is released. This makes it possible to use MC-31 with a PL mount lens that requires tighter mounting than the MC-31’s specifications, allowing the lens to lock securely in place on the converter.
The markings on the upper part of the converter are in the same luminous paint as the one used for SIGMA CINE LENS, helping make it easier to replace or adjust a lens in the dark.

Full-fledged filmmaking is possible
by combining fp and PL mount lens

2019, SIGMA launched a L-Mount camera, SIGMA fp.
SIGMA fp, the world’s smallest and lightest full-size mirrorless camera supports cinema camera-like user interfaces, which means that it can be taken straight to filmmaking settings. The small-size body translates into a smaller system as a whole, which in turn opens new possibilities for the forms of video creation that would have been difficult to achieve with bulky equipment, such as shooting in narrow space or extreme close-ups.
By using MC-31, not only SIGMA CINE LENSES, but also other manufactures PL mount lenses are available to use on SIGMA fp. The MC-31 Contributes to further expansion of the shooting system.

In 2018, Leica, Panasonic and SIGMA launched the L-Mount Alliance, and announced that the three companies were to develop their own camera systems based around the same L-Mount standard.
The L-Mount realizes a camera system that goes beyond the boundaries between manufacturers, with unprecedented levels of scalability and possibilities.
For details on the latest L-mount products and development status, please see below.

* The L-Mount Trademark is a registered Trademark of Leica Camera AG.



Maximum diameter

84.4mm / 3.3in.

Full length

42mm / 1.6in.

Mount reference plane spacing

32mm / 1.2in.


330g / 11.6oz.

Product Lineup


The new MOUNT CONVERTER MC-31 allows you to use your PL mount interchangeable lenses with the L-Mount camera body, such as SIGMA fp / SIGMA fp L.

Supplied Accessories

Cap, Support foot, Hex wrench, Screwdriver,
Mount lock screw, L-Mount shim

Barcode No.