Sigma Sony Fit 17-50mm F2.8 EX DC HSM Auto Focus Wide Lens

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Manufacturer Code: 583205
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Brand:  Sigma
RRP: 459.00383.00Inc VAT 20%You Save:  76.00

Sigma Sony Fit 17-50mm F2.8 EX DC HSM Auto Focus Wide Lens

The Sigma 1750 mm f/2.8 EX DC HSM belongs to the high-end series, marked by the EX symbol. It starts with a metal mount inside which you see the rear element with a diameter of 27 mm. It is placed at the level of the mount for the 17 mm focal length and it collapses over two centimetres inside when you pass to the focal length of 50 mm.

This lens covers a focal length from 17mm wide angle and offers a large aperture of F2.8 throughout the entire zoom range, making it ideal for many types of photography such as portraiture and landscapes.

It uses two elements made from Sigma's new 'FLD glass', plus two glass mold and one hybrid aspherical elements, to reduce aberrations. The minimum focus distance is 28cm across the entire zoom range, giving a maximum magnification of 0.2x, and the 77mm filter thread does not rotate on focusing.

The Sigma 1750 mm f/2.8 has some issues with the work against bright light but fortunately they are not huge. You can catch light artifacts the easiest at the shortest focal length and their intensity increases after the stopping down of the lens. At 30 mm the flares are small and at the maximum focal length they become negligible.

High image quality is assured throughout the entire zoom range. Incorporating HSM (Hyper Sonic Motor), the lens provides fast and quiet AF. The lens has a minimum focusing distance of 28cm (11) throughout the entire zoom range and a maximum magnification ratio of 1:5. The rounded 7 blade diaphragm creates an attractive blur to the out of focus images. The inner focusing system eliminates front lens rotation, making the lens particularly suitable for use with the supplied petal-type lens hood and circular polarizing filters.

The 17-50mm f/2.8 EX DC HSM features the slightly simplified version of Sigma's HSM (hypersonic AF motor). It is still fast and nearly silent but full-time manual (FTM) override is not possible in one-shot AF mode. The AF speed via in contrast AF (Live-View) is on the slow side. Manual focusing is delicate due to the very short focus path - it just takes a turn of 30 degrees to focus from infinity to the close focus limit. This approach improves the AF speed for sure but you need to have some experts skills if you want to do it all manual. The focus accuracy of the tested sample was fine on our test DSLR.

Please note that OS function is not available for Sony and Pentax mounts.

Specifications - Sigma Sony Fit 17-50mm F2.8 EX DC HSM Auto Focus Wide Lens

Focal length 17-50mm
Maximum aperture f/2.8
Minimum aperture f/22
Lens construction 13 groups 17 elements
2 FLD glass elements
Angle of view 72.4-27.9
Closest focus distance 28cm / 11in
Maximum reproduction ratio 1:5
Aperture blades 7 (rounded)
Filter attachment size 77 mm
AF motor HSM motor
Dimensions 83.5mm x 91.8.8mm (3.3in 3.6in)
Mount Sony Fit

Kit Content
Sigma (Sony Fit) HSM 17-50mm F2.8 EX DC OS Auto Focus Wide Lens
Case
Petal-type Hood (LH825-03)

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Customer Reviews on Sigma Sony Fit 17-50mm F2.8 EX DC HSM Auto Focus Wide Lens
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This product was added to our catalog on Saturday 24 April, 2010.