Sigma has created a world first with its latest wideangle prime lens, but how valuable is it in the company’s line-up? Michael Topham investigates

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Sigma 20mm f/1.4 DG HSM | A

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Sigma 20mm f/1.4 DG HSM | A Review

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£849.00

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Sigma 20mm f/1.4 DG HSM | A Review – Test Results

Resolution

The lens resolves a similar level of sharpness in the centre at f/1.4 as it does when it’s stopped down between f/8 and f/11. Our Applied Imaging test results show the lens is at its sharpest in the centre around f/4, but to record the finest level of edge-to-edge sharpness across the frame you’ll want to shoot between f/5.6 and f/8. Users can still achieve great results at f/11, but diffraction does start to soften images slightly when you push to its f/16 minimum.

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Shading

Use the lens at its maximum aperture and images will exhibit obvious vignetting. This can help to draw a viewer’s eye to the centre of an image, but is not to everyone’s taste. Edges are approximately 2EV darker than the centre at f/1.4, but this lessens to 0.6EV darker than the centre at f/2.8. Vignetting can’t be traced when the lens is closed down to f/4.

Sigma 20mm f/1.4 DG HSM | A

Sigma 20mm f/1.4 DG HSM | A shading at 20mm, f/1.4

Sigma 20mm f/1.4 DG HSM | A

Sigma 20mm f/1.4 DG HSM | A shading at 20mm, f/2

Sigma 20mm f/1.4 DG HSM | A

Sigma 20mm f/1.4 DG HSM | A shading at 20mm, f/2.8

Sigma 20mm f/1.4 DG HSM | A

Sigma 20mm f/1.4 DG HSM | A shading at 20mm, f/4

Curvilinear distortion

Barrel distortion can be seen in our test results, with straight lines bowing out slightly towards the corners. If you do want to remove this, it should be a relatively quick fix when Adobe releases a lens profile for Lightroom, Photoshop and Camera Raw. We’re expecting this to be available very soon.

Sigma 20mm f/1.4 DG HSM | A

Sigma 20mm f/1.4 DG HSM | A distortion TV SMIA = -1.5%

  1. 1. Sigma 20mm f/1.4 DG HSM | A Review – Introduction
  2. 2. Sigma 20mm f/1.4 DG HSM | A Review – Features
  3. 3. Sigma 20mm f/1.4 DG HSM | A Review – Build and handling
  4. 4. Sigma 20mm f/1.4 DG HSM | A Review – Image quality
  5. 5. Sigma 20mm f/1.4 DG HSM | A Review – Test Results
  6. 6. Sigma 20mm f/1.4 DG HSM | A Review – Verdict
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