SIGMA MOUNT CONVERTER MC-21 A mount adapter for using SIGMA SA mount lenses on L-mount camera bodies. I accidentally purchased this and only opened the box. I will pack it carefully and ship it. A new converter that expands the L-mount's versatility. The Sigma MOUNT CONVERTER MC-21 is a converter for using Sigma SA mount interchangeable lenses and Sigma-made Canon EF mount interchangeable lenses on L-mount camera bodies. By attaching the MC-21, you can increase the freedom of choice for L-mount cameras and lenses, greatly improving the expandability of the L-mount system. SIGMA mount adapter MC-21, allows the use of compatible lenses with electronic contacts. - Brand: SIGMA - Model Name: MOUNT CONVERTER MC-21 - Included Accessories: Lens cap - Features: Mount adapter, compatible - Specifications: With electronic contacts Thank you for viewing.