Sigma has added something unusual to the APS-C lens lineup. A 12mm f/1.4 ultra wide angle lens opens up creative options you don’t normally get at this focal length, especially if you want to work in low light or experiment with depth of field. This means more flexibility whether you’re shooting landscapes, interiors, or even the night sky.
Coming to you from Christopher Frost, this detailed video covers the Sigma 12mm f/1.4 DC Contemporary lens. It’s a compact, lightweight prime designed specifically for APS-C cameras, with mounts for Sony E, Fujifilm X, and Canon RF systems. What makes it stand out is the unusually bright f/1.4 aperture paired with such a wide field of view. That combination isn’t common, which means you can gather a huge amount of light while still capturing expansive scenes. For astrophotography, in particular, the ability to shoot at f/1.4 with this perspective is a big deal.
Frost explains that the 12mm focal length translates to about 18mm full frame equivalent, which hits the sweet spot: ultra wide without crossing into territory that feels distorted or hard to compose. With the aperture wide open, you can blur backgrounds in a way that’s rare for this type of lens. That close focusing distance lets you play with perspective, pulling a subject up close while stretching out the environment behind it. He also shows how it doubles as a practical vlogging lens thanks to its sharpness, compact build, and the kind of subject separation you’d normally expect from longer focal lengths.
Key Specs
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Focal Length: 12mm
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Aperture: Maximum f/1.4, Minimum f/16
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Lens Mount: Canon RF, Sony E, Fujifilm X
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Lens Format Coverage: APS-C
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Minimum Focus Distance: 6.8" / 17.2 cm
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Magnification: 0.12x (1:8.4 ratio)
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Optical Design: 14 elements in 12 groups
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Aperture Blades: 9, rounded
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Focus Type: Autofocus
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Image Stabilization: None
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Filter Size: 62mm (front)
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Dimensions: 2.7 x 2.7" / 69 x 67.4 mm
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Weight: 8.8 oz / 250 g
Build quality is solid for its price point. The lens is lightweight at just 250 g, uses plastic in its design, but still includes dust and splash resistance with a weather-sealing gasket at the mount. Autofocus is quick and nearly silent, and there’s an aperture ring with clicked stops, though on the RF mount version, it acts as a customizable control ring instead. The absence of image stabilization isn’t critical at this focal length, but you’ll rely on your camera’s stabilization if you need it.
Image quality is where this lens really surprises. Wide open at f/1.4, it’s sharp in the center with good contrast, and stopping down to f/2 improves sharpness across the frame. Corners brighten and sharpen quickly by f/2.8. Distortion and vignetting are noticeable without corrections, but with in-camera or raw adjustments, they’re well managed. Frost points out that coma and chromatic aberration are present wide open but improve as you stop down, making it a practical choice for starscapes if you know how to work around its limits. Check out the video above for the full rundown from Frost.
3 Comments
Great review. That looks to be a lovely little lens!
In a mirrorless digital camera would the need for a f/1.4 lens is needed for what? I m glad the APS-C world has such a lens, but I stated in the full frame world in 2014 with the A7SM1 and in 2015 found out that the APS-C lens Sony E 10-18mm (15- 27mm in 35mm) f/4 OSS works in full frame mode from 12-18mm. A 12mm lens for Full Frame cameras did not come about till July 2017 by Sony with the FE 12-24mm f/4 and the f/2.8 not till August 2020, These two lenses are monster big needing external filter holders for big glass filters compared to the little tiny E 10-18mm with threads up front for filters. Yes an f/4 lens while other makers like Rokinon made one but with barrel and corners so poor it took Lrc a few years to make a LC for.
My point even though I bought all those lenses thinking they were good as told by reviewers over the years my E 10- 18mm f/4 is still used today for dark night Astro Milky Way's that are bright as day images with star field skies, also few astro photographers process their image brightly thinking dark is the way the human eye see's a dark sky. Back in 2015 my first of MW captures had colors of trees and flowers also the upper atmosphere colors of gasses red, green and yellow for example and I thought my camera sensor was bad but after some study all is fine. I say this about an f/4 lens that came out in 2013 before the Sony A7 models that image were perfect from upper sky to the grounds green grass in front of my camera or beach sand with sharp sea shells and very sharp buildings on the horizon, lens sharpness far away at night is different than daytime where in daytime you look for bokeh.
Today my E 10-18mm f/4 lens sets atop my panorama rig for MW Arch's because it is so small and light as a feather not needing extra torque on dials. Also rarely do I go above ISO 3200 or 6400.
Just to be extra informing I came from the Canon EOS REBEL T2i and one night trying to get a setting moon behind a light house and with no idea about the Milky Way what so ever April 2014 I captured the Milky Way when aiming southward to get some boats in the river.
#3 Canon EOS REBEL T2i
#4 using the 10-18 on A7SM1 using on camera app "Digital Filter" to capture the lit foreground first and the dark sky second all processed in camera as jpeg and raw, If you can find a A7/R/S Mod's 1 and 2 with the apps on it, it will be more valuable! They are no longer sold or downloadable!
Lastly just look at those pin point stars even in the corners captured with a f/4 2013 lens