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Sigma Mount Converter MC-31 lets you use PL cine lenses on L-mount cameras

Sigma Mount Converter MC-31
(Image credit: Sigma)

Sigma has announced that its MC-31 Mount Converter will go on sale at the end of this month, and will retail for a price of $679 / £649. The lens accessory allows you to fit any PL-mount cine lens onto an L-mount mirrorless camera.

The PL-mount is the standard bayonet fitting in the filmmaking industry – originally pioneered by Arri, but widely adopted by all cine lens manufacturers.

The L-mount is the full-frame mirrorless mount developed by Leica - but which is now also used on Panasonic and Sigma full-frame mirrorless cameras, such as the Sigma fp and the Panasonic S1R.

The Sigma Mount Converter MC-31 has an aluminum alloy body, a brass mount and the standard PL locking ring which ensures a secure connection between lens and camera.

(Image credit: Sigma)

(Image credit: Sigma)

(Image credit: Sigma)

The adaptor has in-buit shim adjustments, that allow the user to adjust the flange depth to be adjusted on two points on the mount – to ensure that the lens and camera sensor are perfectly aligned.

Weighing 330g, the MC-31 has a removable tripod socket, and the markings on the converter are in the same luminous paint found n Sigma's own cine lenses, to ease of operation in low light.

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Chris George

Chris George has worked on Digital Camera World since its launch in 2017. He has been writing about photography, mobile phones, video making and technology for over 30 years – and has edited numerous magazines including PhotoPlus, N-Photo, Digital Camera, Video Camera, and Professional Photography. 


His first serious camera was the iconic Olympus OM10, with which he won the title of Young Photographer of the Year - long before the advent of autofocus and memory cards. Today he uses a Nikon D800, a Fujifilm X-T1, a Sony A7, and his iPhone 11 Pro.


He has written about technology for countless publications and websites including The Sunday Times Magazine, The Daily Telegraph, Dorling Kindersley, What Cellphone, T3 and Techradar.