Sigma 28mm F1.8 EX DG ASP Macro
Sigma 28mm F1.8 EX DG ASP Macro
Top 18%40 points
Top 18%
Top specs and features

Sigma 28mm F1.8 EX DG ASP Macro: 28 facts and highlights

1. 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. 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.

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.

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.

5. 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.

6. 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.

7. 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.

8. chromatic aberration

The lateral chromatic aberration result from the DxOMark set of metrics. Chromatic aberration is a type of distortion which results in colour fringing along edges within the image. Tested with Nikon D7000 or Canon 7D. Source: DxOMark.

9. 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 28mm F1.8 EX DG ASP Macro
53% have it

11. 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.

12. 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.

13. 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.

14. 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.

15. Has a metal mount

A metal mount is generally superior to a plastic mount as it is more durable.
Sigma 28mm F1.8 EX DG ASP Macro
83% have it

16. Has focus motor

Lenses with a built-in focus motor can autofocus even if the camera does not have its own focus motor.
Sigma 28mm F1.8 EX DG ASP Macro
87% have it

17. Has full-time manual focus

With full-time manual focus you can move the focus ring whilst it is in AF (auto focus) mode. This means that you can make manual adjustments once the AF has finished, without changing to manual mode.
Sigma 28mm F1.8 EX DG ASP Macro
69% have it

18. 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.

19. 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).

20. smallest aperture at minimum 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.

21. 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.

22. has or is a prime lens

A prime lens has a fixed focal length. In general, these are sharper, with a wider aperture.
Sigma 28mm F1.8 EX DG ASP Macro
47% have it

23. 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.

24. Is a macro lens

A macro lens is used to take very close-up photos, allowing you to capture flowers, insects etc. in great detail. A macro lens is any lens with 1:1 magnification.
Sigma 28mm F1.8 EX DG ASP Macro
10% have it

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).

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