Sigma 17-50mm F2.8 EX DC OS HSM
Sigma 17-50mm F2.8 EX DC OS HSM
Top 16%4,494 points
Top 16%
Top specs and features

Sigma 17-50mm F2.8 EX DC OS HSM review: 28 facts and highlights

1. widest aperture

With a wider aperture the sensor can capture more light, helping to avoid blur by enabling a faster shutter speed. It also provides a shallow depth of field, allowing you to blur the background to focus attention on the subject.
f/2.8
Samyang XP 50mm f/1.2: f/1.2

2. widest aperture at maximum focal length

With a wider aperture the sensor can capture more light, helping to avoid blur by enabling a faster shutter speed. It also provides a shallow depth of field, allowing you to blur the background to focus attention on the subject.
2.8f
Samyang XP 50mm f/1.2: 1.2f

3. sharpness result

The sharpness result from the DxOMark set of metrics. This result is based on the MTF (modulation transfer function) measurement, and gives an overall indication of the sharpness of images produced by the lens. Tested with Nikon D7000 or Canon 7D. Source: DxOMark.
10P-MPix
Zeiss Batis 25mm F2: 22P-MPix

4. transmission

The transmission result from the DxOMark set of metrics. Transmission refers to the amount of light that reaches the sensor through all of the glass elements of a lens, with a lower TStop signifying more light. This is important as less light reaching the sensor can lead to the requirement of higher ISOs or slower shutter speeds. Tested with Nikon D7000 or Canon 7D. Source: DxOMark.
3.1TStop
Canon EF 85mm F/1.2L II USM: 1.4TStop

5. has a silent focus motor built into the lens

Lenses with built-in focus motor focus faster and more quietly than lenses without a focus motor which rely on the camera's body focus motor.
Sigma 17-50mm F2.8 EX DC OS HSM
54% have it

6. DxOMark score

DxOMark is a set of tests to measure the performance and quality of lenses and cameras. The DxOMark score is the overall score given to the lens. Tested with Nikon D7000 or Canon 7D. Source: DxOMark.
17
Zeiss Batis 25mm F2: 39

7. chromatic aberration

The lateral chromatic aberration result from the DxOMark set of metrics. Chromatic aberration is a type of distortion which results in color fringing along edges within the image. Tested with Nikon D7000 or Canon 7D. Source: DxOMark.
10µm
Nikon AF Micro-Nikkor 200mm F/4D IF-ED: 1µm

8. Has focus motor

Lenses with a built-in focus motor can autofocus even if the camera does not have its own focus motor.
Sigma 17-50mm F2.8 EX DC OS HSM
87% have it

9. smallest aperture at maximum focal length

A smaller aperture reduces the amount of light reaching the sensor. This is important in bright conditions where a wider aperture could result in your image being overexposed. Another advantage is that with a smaller aperture you get a greater depth of field, and can keep all of the image in focus.
22f
Pentax HD DA 560mm F5.6 ED AW: 45f

10. has built-in optical image stabilization

Optical image stabilization uses gyroscopic sensors to detect the vibrations of the camera. The lens adjusts the optical path accordingly, ensuring that any type of motion blur is corrected before the sensor captures the image.
Sigma 17-50mm F2.8 EX DC OS HSM
38% have it

11. minimum focus distance

This is the closest distance that the lens can focus. A shorter minimum focus distance allows you to get closer to your subject, and is particularly important when doing macro photography.
0.28m
Zeiss Batis 40mm f/2 CF: 0.02m

12. Has rounded aperture blades

Similar to the number of aperture blades, rounded blades affect the way the light gets through to the sensor. Rounded blades, often only found on more expensive lenses, improve the appearance of the out-of-focus areas. This allows you to attain better, softer looking bokeh in your photos.
Sigma 17-50mm F2.8 EX DC OS HSM
70% have it

13. minimum focal length

A shorter minimum focal length allows you to get more of the scene in the photo, and offers a wider angle of view than longer focal lengths.
17mm
Canon EF 35mm F/2 IS USM: 0.24mm

14. maximum focal length

A longer maximum focal length allows you to focus in on a small part of a scene, and offers a narrower angle of view than shorter focal lengths.
50mm
Sigma 300-800mm F5.6 EX DG APO HSM: 800mm

15. aperture blades

The aperture controls how much light gets through to the camera’s sensor. More blades is often an indicator of a better quality lens. It also allows you to achieve much nicer looking bokeh when blurring out your background, whereas a lens with less blades will often produce harsher, more polygonal bokeh.
7
Lensbaby Velvet 85: 12

16. Front element doesn't rotate

The front element doesn’t rotate. This is important if you use filters, as some such as polarising or gradient filters have to be orientated a certain way.
Sigma 17-50mm F2.8 EX DC OS HSM
49% have it

17. distortion

The distortion result from the DxOMark set of metrics. Distortion in the lens refers to the variation of magnification throughout the image. More distortion will result in straight lines being recorded incorrectly in the image. Tested with Nikon D7000 or Canon 7D. Source: DxOMark.
0.3%
Zeiss Otus 85mm F/1.4 ZF: 0%

18. weight

565g
Canon EF 400mm F/4 DO IS II USM: 2.1g

19. vignetting

The vignetting result from the DxOMark set of metrics. Vignetting refers to when the brightness of an image changes from the center towards the edges, resulting in darkened corners. A result of 0 is perfect and the image will have no vignetting. Tested with Nikon D7000 or Canon 7D. Source: DxOMark.
-1.1
Canon EF 24mm F/2.8 IS USM: 2

20. minimum angle of view

At the longest end of the lens you get the narrowest angle of view. This allows you to fit a small portion of the scene into the photograph, such as when you are zooming in on a subject (based on APS-C format).
27.9°
Tamron SP 150-600mm F/5-6.3 Di VC USD: 2°

21. optical zoom

The zoom range is the ratio between the longest and shortest focal lengths. A higher zoom range means that the lens is more versatile.
3x
Tamron 18-400mm f/3.5-6.3 Di II VC HLD: 22.2x

22. Can focus to infinity

Many lenses allow you to focus to infinity. This is essential when you wish to take photos including far off objects, such as when shooting landscapes, in order to make sure everything is sharp and in focus.
Sigma 17-50mm F2.8 EX DC OS HSM
79% have it

23. Has a metal mount

A metal mount is generally superior to a plastic mount as it is more durable.
Sigma 17-50mm F2.8 EX DC OS HSM
78% have it

24. magnification

A true macro lens has a magnification of 1:1. This means that the image produced is a life-size representation of the subject being photographed.
0.2x
Leica Vario-Elmarit-SL 24-90mm F2.8-4 ASPH: 14x

25. maximum angle of view

At the shorter end of the lens you get the widest angle of view. This allows you to fit more of the scene into the photograph (based on APS-C format).
72.4°
Leica APO-Summicron-SL 75mm f/2 ASPH: 318°

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