Lens Test: Sigma 18–35mm f/1.8 DC HSM

The industry's fastest zoom lens is also one of the sharpest

sigma1836spsc.jpg
Compatible with Sigma’s unique USB docking station ($699, street), the lens can update firmware over the Internet and fine-tune focusing parameters to suit users’ specifica­tions.
Sigma 18-35 f/1.8 no.01

Sigma 18-35 f/1.8 no.01

Tech Specs: ISO 400, 1/1250 sec, f/8.
Focal Length: 35mm
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Dan Bracaglia
Sigma 18-35 f/1.8 no.02

Sigma 18-35 f/1.8 no.02

Tech Specs: ISO 400, 1/800 sec, f/8.
Focal Length: 23mm
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Dan Bracaglia
Sigma 18-35 f/1.8 no.03

Sigma 18-35 f/1.8 no.03

We ran into some softness issues shooting at f/1.8, especially when zoomed all the way out to 18mm and shooting scenes that were more than a few feet away. However, this can likely be attributed to this being a prototype lens. Tech Specs: ISO 100, 1/1600 sec, f/1.8.
Focal Length: 35mm
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Dan Bracaglia
Sigma 18-35 f/1.8 no.04

Sigma 18-35 f/1.8 no.04

Unlike the last image, when shooting close-up subjects, we had no issues achieving sharp focus at f/1.8 when zoomed in to 35mm, or zoomed out to 18mm (see next slide). Tech Specs: ISO 100, 1/1600 sec, f/1.8.
Focal Length: 35mm
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Dan Bracaglia
Sigma 18-35 f/1.8 no.05

Sigma 18-35 f/1.8 no.05

Tech Specs: ISO 100, 1/400 sec, f/1.8. Exposure compensation of -0.7.
Focal Length: 18mm
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Dan Bracaglia
Sigma 18-35 f/1.8 no.06

Sigma 18-35 f/1.8 no.06

Tech Specs: ISO 100, 1/800 sec, f/2.8.
Focal Length: 25mm
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Dan Bracaglia
Sigma 18-35 f/1.8 no.07

Sigma 18-35 f/1.8 no.07

Tech Specs: ISO 800, 1/320 sec, f/4.
Focal Length: 19mm
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Dan Bracaglia
Sigma 18-35 f/1.8 no.08

Sigma 18-35 f/1.8 no.08

Tech Specs: ISO 400, 1/80 sec, f/9. br>Focal Length: 18mm
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Dan Bracaglia
Sigma 18-35 f/1.8 no.09

Sigma 18-35 f/1.8 no.09

Tech Specs: ISO 400, 1/125 sec, f/9. Exposure compensation of -0.7.
Focal Length: 18mm
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Dan Bracaglia
Sigma 18-35 f/1.8 no.10

Sigma 18-35 f/1.8 no.10

Tech Specs: ISO 400, 1/4000 sec, f/9.
Focal Length: 52mm
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Dan Bracaglia
Sigma 18-35 f/1.8 no.11

Sigma 18-35 f/1.8 no.11

Tech Specs: ISO 1600, 1/125 sec, f/5.
Focal Length: 32mm
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Dan Bracaglia
Sigma 18-35 f/1.8 no.12

Sigma 18-35 f/1.8 no.12

Tech Specs: ISO 100, 1/500 sec, f/9.
Focal Length: 18mm
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Dan Bracaglia
Sigma 18-35 f/1.8 no.13

Sigma 18-35 f/1.8 no.13

The next few images are meant to demonstrate the full zoom-range and aperture range of the lens. Tech Specs: ISO 1600, 1/400 sec, f/16.
Focal Length: 52mm
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Dan Bracaglia
Sigma 18-35 f/1.8 no.14

Sigma 18-35 f/1.8 no.14

Again, once we opened up the aperture to f/1.8, we ran into some very noticeable problems obtaining sharp focus on anything more than a few feet away. For now will attribute this to the fact that we were using a prototype. Tech Specs: ISO 100, 1/4000 sec, f/1.8.
Focal Length: 18mm
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Dan Bracaglia
Sigma 18-35 f/1.8 no.15

Sigma 18-35 f/1.8 no.15

Tech Specs: ISO 400, 1/160 sec, f/16.
Focal Length: 35mm
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Dan Bracaglia
Sigma 18-35 f/1.8 no.16

Sigma 18-35 f/1.8 no.16

Tech Specs: ISO 100, 1/4000 sec, f/1.8.
Focal Length: 35mm
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Dan Bracaglia
Sigma 18-35 f/1.8 no.17

Sigma 18-35 f/1.8 no.17

Tech Specs: ISO 800, 1/1250 sec, f/5.6. Focal Length: 35mm
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Dan Bracaglia
Sigma 18-35 f/1.8 no.18

Sigma 18-35 f/1.8 no.18

Tech Specs: ISO 100, 1/1000 sec, f/5.6. Focal Length: 18mm
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Dan Bracaglia
Sigma 18-35 f/1.8 no.19

Sigma 18-35 f/1.8 no.19

Tech Specs: ISO 800, 1/400 sec, f/5.6. Focal Length: 18mm
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Dan Bracaglia
Sigma 18-35 f/1.8 no.20

Sigma 18-35 f/1.8 no.20

Tech Specs: ISO 800, 1/60 sec, f/5. Exposure compensation of -0.7.
Focal Length: 18mm
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Dan Bracaglia