Sigma 12mm F1.4 DC Contemporary (Canon RF)

The Sigma 12mm F1.4 DC Contemporary is an ultra‑wide‑angle prime lens made specifically for APS‑C‑format Canon RF‑S mirrorless cameras (e.g., Canon EOS R7, R10). It combines a very wide field of view with a bright f/1.4 maximum aperture, enabling strong performance in low‑light situations, creative depth‑of‑field effects, and versatile use for stills and video.

Key Features

• Ultra‑Wide Prime: 12 mm focal length delivers an expansive field of view (≈19.2 mm equivalent on full‑frame Canon APS‑C bodies).
• Bright Aperture: f/1.4 maximum aperture for excellent low‑light capability and shallow depth‑of‑field effects.
• Optical Design: 14 elements in 12 groups with three aspherical and two SLD elements to reduce aberrations and improve image clarity.
• 9‑Blade Rounded Diaphragm: Smoother out‑of‑focus highlights (bokeh) when shooting wide open.
• Stepping Motor (AF): Fast, quiet autofocus suitable for stills and video, with minimal focus breathing.
• Compact and Lightweight: Weighs about 225 g and measures ~69 mm long, making it highly portable for travel and handheld use.
• Weather‑Sealed: Dust‑ and splash‑resistant construction supports outdoor shooting.
• Control/Aperture Ring: On Canon RF bodies the ring can be used to control aperture or assigned functions.
• Minimum Focus: ~0.17 m, with a 0.12× magnification — useful for creative close‑up wide shots.
• Filter Thread: 62 mm for compatible screw‑on filters.
• Supplied Accessories: Lens hood, front/rear caps, pouch (varies by retailer).

Optical & Image Performance

This lens delivers sharp performance across the frame, even at the wide‑open f/1.4 aperture. Its advanced optical design helps control distortion, chromatic aberration, and flare, making it reliable for landscapes, architecture, and night sky photography. The wide field and fast aperture also suit creative video and astrophotography. 

Technical Summary

• Focal Length: 12 mm (APS‑C)
• Maximum Aperture: f/1.4
• Minimum Aperture: f/16
• Optical Groups/Elements: 14/12
• Diaphragm Blades: 9 (rounded)
• Minimum Focus: 0.17 m
• Magnification: 0.12×
• Filter Thread: 62 mm
• Size/Weight: ~69 mm length, ~225 g weight
• Image Stabilization: None (use camera IBIS if available)