Sigma SA Lenses

10 interactive lens diagrams

Sigma SA autofocus SLR and mirrorless mount, 1990s-2010s | Primarily APS-C and full-frame Sigma bodies

Sigma SA was the company's own autofocus mount for cameras sold alongside its third-party lens business. It hosted Sigma film SLRs, digital SD bodies, and the later sd Quattro mirrorless bodies, with many lenses adapted from Sigma's broader optical catalog.

The mount is most interesting because it pairs Sigma lens design with Sigma's Foveon-sensor camera lineage. That makes the system a distinctive mix of conventional SLR-style lens geometry, proprietary camera bodies, and unusually color-focused digital capture rather than a large mainstream ecosystem.

SA pages in this catalog represent a smaller ecosystem than Canon, Nikon, or Sony mounts, but they show Sigma as a complete camera-system maker rather than only an independent lens supplier. They are also helpful when comparing multi-mount Sigma formulas that share optics across several camera systems.

Mount interface

Flange focal distance 44 mm, bayonet mount. 0° at 12 o'clock from the camera front; the lens-side view is the horizontal mirror. Dotted strokes mark photo-scaled or schematic (not-to-scale) dimensions.

Sigma SA mount — camera-side front view (base)Sigma SA bayonet mount, camera-side front view. Flange focal distance 44 mm, nominal throat 44 mm. Profile sigma-sa/base.
Camera-side front
Sigma SA mount — lens-side rear view (base)Sigma SA bayonet mount, lens-side rear view. Flange focal distance 44 mm, nominal throat 44 mm. Profile sigma-sa/base.
Lens-side rear
Throat / openingMount ringBayonet lug / slotLock pin / notchIndex markElectrical contactMechanical couplingScrews / sealsDatum & axis
SIGMA 105mm f/1.4 DG HSM | Art— 17 elements / 12 groups, f = 101.85 mm design, F1.46 design / f/1.4 nominalSIGMA 14-24mm f/2.8 DG HSM | Art— 17 elements / 11 groups, 14.50-23.15 mm design, F2.93 design / F2.8 marketedSIGMA 20mm f/1.4 DG HSM | Art— 15 elements / 11 groups, Patent f = 20.69 mm, Patent F1.46; marketed F1.4SIGMA 30mm f/1.4 DC HSM | Art— 9 elements / 8 groups, f = 30.785 mm design, F1.4 marketed / F1.46 designSIGMA 35mm f/1.4 DG HSM | Art— 13 elements / 11 groups, f = 35.16 mm design, F1.45 design / F1.4 marketedSIGMA 50mm f/1.4 DG HSM | Art— 13 elements / 8 groups, f = 49.58 mm design, F1.4 nominal / F1.46 designSIGMA 85mm f/1.4 DG HSM | Art— 14 ELEMENTS / 12 GROUPS, f ≈ 83.4 mm, F/1.46SIGMA APO Macro 105mm f/2.8 EX DG OS HSM— 16 elements / 11 groups, 105 mm marketed; 101.71 mm design, F2.8 marketed; F2.91 designSIGMA APO MACRO 150mm f/2.8 EX DG OS HSM— 19 elements / 13 groups, f = 149.99 mm design / 150 mm nominal, F2.92 design / F2.8 nominalSIGMA APO Macro 180mm f/2.8 EX DG OS HSM— 19 elements / 14 groups, 180 mm f/2.8 marketed; 174.60 mm f/2.92 design, 0.47 m MFD / 1:1 macro