SIGMA 17

Sigma 17-50 mm 2.8 EX DC OS HSM & Nikon D3200 (N APS-C)

The Sigma 17-50 mm, fully named Sigma 17-50 mm 2.8 EX DC OS HSM, is a fast, constant f/2.8 standard zoom lens, which was introduced in 2010. This Sigma lens is designed exclusively for camera’s with a DX / APS-C sensor. It’s not only a fast lens, it also offers built-in image stabilization, which – according to lớn Sigma – delivers an extra 4 stops. The image stabilization is not available for a Sony or Nikon mount. This is a light và very versatile lens; ideal for travel photography. Together with the Tamron 17-50 mm, takes its own position on the market. It is remarkable that Nikon offers no real counterpart with integrated image stabilization.

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Field of View Sigma 17-50mm
17 mm

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FOV Sigma 17-50mm
50 mm

Construction và autofocus

The Sigma 17-50mm house is of a high unique plastic và during focusing, the filter does not rotate. The zoom ring has just the right friction và runs smoothly over the entire process. The focus ring has, in manual mode, a very short stroke. Manual focusing is therefore not easy.

The drive of the autofocus is done with an HSM drive & is almost silent. Manually overruling the autofocus is possible whenever you wish to. The minimum focusing distance is 28 cm over the entire zoom range, Focusing is fast with a Nikon D7000 và accurately even in low light; from 15 meters khổng lồ 1.5 meters in 0.22 seconds.

Sigma OS Image stabilization

The image stabilization, abbreviated OS, does its job almost inaudibly & the OS effectiveness is measured using a Nikon D7000 at a focal length of 50 mm. The gain is about 3 stops, which is a little less as claimed by Sigma. That’s nothing special; other manufacturers seem khổng lồ be one stop more optimistic about their IS-effectiveness in comparison with our measurements as well.

Vignetting Sigma 17-50

The vignetting of the Sigma 17-50mm, expressed in stops, is low. The remnant, at f/2.8, can be corrected with the right software.

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Distortion Sigma 17-50

The distortion shown by the Sigma 17-50 mm, expressed as a percentage, is substantial at 17 mm & visible up khổng lồ 26 mm, but remarkably low in other focal lengths. Distortion can be corrected easily afterwards with software.

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Sigma 17-50 mm Bokeh

The Sigma 17-50 mm provides for a lens on a camera with an APS-C sensor, a nice round bokeh. However, a ring structure becomes visible in the individual bokeh circles.

The high brightness of this specifically for cameras with APS-C sensor designed Sigma 17-50 lens provides furthermore the ability to play with depth of field. The depth of field for an f/2.8 lens on a camera with an APS-C sensor corresponds approximately to lớn an f/4 lens on a camera with a full frame sensor.

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Flare

At strong backlight, the lens is troubled by both flare & ghosting. In practice, you should take this into account. Compliments for the không tính phí hood which is included by Sigma.

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Resolution Sigma 17-50

Earlier we tested the resolution of the Sigma 17-50mm lens using a Nikon D7000 camera. This review shows that this lens performs even better using a 24 megapixel Nikon D3200 camera. The resolution, expressed in LW/PH, reaches very high values at almost all focal lengths và apertures in the center; stopping down is hardly necessary. The resolution in the corners lags clearly behind, however, in particular at 17 và 28 mm.

Chromatic aberration Sigma 17-50

According to lớn Sigma, two “F” Low Dispersion glass elements, with the same optical properties as fluorite glass, correct màu sắc aberrations. At all focal length / aperture combinations, this Sigma 17-50 mm jpg files showed very low chromatic aberration. This very good performance is also because of in-camera correction of remaining chromatic aberration by the Nikon D3200 . In the image below you can see that chromatic aberration in the uncorrected RAW files will be visible at large magnifications. This can be corrected easily in Photoshop or Lightroom.