The Sigma Mount Converter Mc-21 allows Sigma Sa mount 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 from Sigma, Leica Camera and Panasonic, enhancing the extensibility of the L-Mount system. Effective use of lens investment Attaching the Mc-21 to your collection of Sigma Sa mount and Sigma's Canon Ef mount compatible lenses allows them to be used as L-Mount system lenses, promoting the effective use of valuable lenses already owned. 29 interchangeable lenses available to be used for L-Mount cameras The Mc-21 increases the number of interchangeable lenses manufactured by Sigma that can be used with the L-Mount system by 29 lenses. Compatible with the autocrop function, mounting Aps-c size image circle Dc lenses to a camera body equipped with a 35mm full size sensor still allows immediate use for shooting. 12-24mm F4 Dg Hsm | Art 14-24mm F2.8 Dg Hsm | Art 24-35mm F2 Dg Hsm | Art 24-70mm F2.8 Dg Os Hsm | Art 24-105mm F4 Dg Os Hsm | Art 60-600mm F4.5-6.3 Dg Os Hsm | Sports 70-200mm F2.8 Dg Os Hsm | Sports 100-400mm F5-6.3 Dg Os Hsm | Contemporary 120-300mm F2.8 Dg Os Hsm | Sports 150-600mm F5-6.3 Dg Os Hsm | Sports 150-600mm F5-6.3 Dg Os Hsm | Contemporary 14mm F1.8 Dg Hsm / Art 20mm F1.4 Dg Hsm / Art 24mm F1.4 Dg Hsm / Art 28mm F1.4 Dg Hsm / Art 35mm F1.4 Dg Hsm / Art 40mm F1.4 Dg Hsm / Art 50mm F1.4 Dg Hsm / Art 70mm F2.8 Dg Macro / Art 85mm F1.4 Dg Hsm / Art 105mm F1.4 Dg Hsm / Art 135mm F1.8 Dg Hsm / Art 500mm F4 Dg Os Hsm / Sports 17-70mm F2.8-4 Dc Macro Os Hsm | Contemporary 18-35mm F1.8 Dc Hsm | Art 18-200mm F3.5-6.3 Dc Macro Os Hsm | Contemporary 18-300mm F3.5-6.3 Dc Macro Os Hsm | Contemporary 50-100mm F1.8 Dc Hsm | Art 30mm F1.