Sigma SA Lenses

28 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 15mm f/2.8 EX DG DIAGONAL FISHEYE— 7 ELEMENTS / 6 GROUPS, DESIGN f = 15.3 mm, DESIGN F/2.8SIGMA 18-35mm f/1.8 DC HSM | Art— 17 ELEMENTS / 12 GROUPS, DESIGN f = 18.60–33.78 mm, DESIGN F/1.86SIGMA 20mm f/1.4 DG HSM | Art— 15 elements / 11 groups, Patent f = 20.69 mm, Patent F1.46; marketed F1.4SIGMA 24-105mm f/4 DG OS HSM Art— 19 ELEMENTS / 14 GROUPS, NATIVE DESIGN 24.86-101.70 mm, 4 ASPHERICAL SURFACESSIGMA 24-70mm f/2.8 DG OS HSM | Art— 19 ELEMENTS / 14 GROUPS, DESIGN f = 24.84–67.55 mm, DESIGN F/2.93SIGMA 24-70mm f/3.5-5.6 ASPHERICAL HF— 9 ELEMENTS / 7 GROUPS, DESIGN f = 25.0-67.6 mm, DESIGN F/3.62-5.79SIGMA 24mm f/1.8 EX DG ASPHERICAL MACRO— 10 ELEMENTS / 9 GROUPS, DESIGN f = 24.69 mm, DESIGN F/1.85SIGMA 28mm f/1.4 DG HSM | Art— 17 ELEMENTS / 12 GROUPS, DESIGN f = 28.72 mm, DESIGN F/1.46SIGMA 28mm f/1.8 EX DG ASPHERICAL MACRO— 10 ELEMENTS / 9 GROUPS, DESIGN f = 27.10 mm, DESIGN F/1.86SIGMA 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 4.5mm f/2.8 EX DC CIRCULAR FISHEYE HSM— 13 ELEMENTS / 9 GROUPS, DESIGN f = 4.45 mm, DESIGN F/2.9SIGMA 40mm f/1.4 DG HSM | Art— 16 ELEMENTS / 12 GROUPS, f ≈ 41.2 mm, F/1.4SIGMA 50mm f/1.4 DG HSM | Art— 13 elements / 8 groups, f = 49.58 mm design, F1.4 nominal / F1.46 designSIGMA 60-600mm f/4.5-6.3 DG OS HSM | Sports— 25 ELEMENTS / 19 GROUPS, DESIGN f = 62.03–577.73 mm, DESIGN F/4.48–6.50SIGMA 70-300mm f/4-5.6 DG OS— 16 ELEMENTS / 11 GROUPS, DESIGN f = 70.33-290.5 mm, DESIGN F/4.15-5.84SIGMA 85mm f/1.4 DG HSM | Art— 14 ELEMENTS / 12 GROUPS, f ≈ 83.4 mm, F/1.46SIGMA 85mm f/1.4 EX DG HSM— 11 ELEMENTS / 8 GROUPS, DESIGN f = 83.58 mm, DESIGN F/1.46SIGMA APO 50-500mm f/4-6.3 EX RF HSM— 20 ELEMENTS / 16 GROUPS, DESIGN f = 50.16–483.77 mm, DESIGN F/4.15–6.39SIGMA APO 50-500mm f/4.5-6.3 DG OS HSM— 22 ELEMENTS / 16 GROUPS, DESIGN f = 51.50–485.00 mm, DESIGN F/4.57–6.47SIGMA APO 80-400mm f/4.5-5.6 EX OS— 20 ELEMENTS / 14 GROUPS, DESIGN f = 81.24-389.46 mm, DESIGN F/4.46-5.83SIGMA 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 macroSIGMA APO MACRO 180mm f/5.6 UC— 9 ELEMENTS / 6 GROUPS, DESIGN f = 174.86 mm, DESIGN F/5.71SIGMA 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 MACRO 70mm f/2.8 EX DG— 10 ELEMENTS / 9 GROUPS, DESIGN f = 68.91 mm, DESIGN F/2.88