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Sigma 24-70mm f/2.8 EX DG HSM Interchangeable Lens Review

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Category: Interchangeable Lenses
Product: Sigma Sigma 24-70mm f/2.8 EX DG HSM
Price: £600.00
Rating: 4 out of 54 out of 54 out of 54 out of 54 out of 5

Sigma 24-70mm f/2.8 EX DG HSM review - A standard zoom for full frame camera bodies with a fast f/2.8 maximum aperture throughout the range and silent HSM focusing.

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Handling and features
Performance
Verdict
Specification

Sigma 24-70mm f/2.8 EX DG HSM
Gary Wolstenholme takes a look at Sigma's flagship standard zoom lens for full-frame cameras.

Sigma's 24-70mm f/2.8 EX DG HSM sports a fast maximum aperture of f/2.8 throughout the zoom range and silent HSM focusing. Being an EX lens it sits at the top of their professional zoom range and costs around £600.

Alternatives from other third party manufacturers include Tamron's SP 28-75mm f/2.8 XR Di, reviewed here which only costs £360, but doesn't have the silent focusing motor of the Sigma.

Competition from camera manufacturers include Canon's well regarded EF 24-70mm f/2.8L USM, which costs around £930. Nikon also make a 24-70mm f/2.8 which costs around £1190. Both have weather sealed build quality.

Sony users have the 24-70mm f/2.8 ZA SSM T* lens, which costs around £1500 due to the Carl Zeiss branding and technologies employed such as the T* coatings to reduce flare and improve contrast.

Sigma 24-70mm f/2.8 EX DG HSM: Handling and features
The design of Sigma's 24-70mm is more short and stubby than alternatives offered by other manufacturers. Although it's not any heavier than alternatives this wide 88.6mm  diameter barrel makes the lens feel quite chunky. High quality plastics have been used in the construction and much of the exterior has a smart powder coating effect applied to it. Although this finish looks really good when new, I find it marks easily, even with light use.

Focus is powered by a HSM motor, which provides fast, silent and accurate autofocus performance throughout the range. As focus is performed internally the front filter thread does not rotate, which should please users of polarising filters and neutral density graduated filters. The HSM motor used also allows for manual focus adjustments at any time and the focus ring does not rotate during AF, which I find helps with the handling of the lens.

The zoom mechanism is damped well and is very smooth to operate, only tightening slightly at the telephoto end of the range. I had no issues with zoom creep during use either as the mechanism provides ample resistance to prevent the lens zooming under its own weight.

Sigma 24-70mm f/2.8 EX DG HSM: Performance
At f/2.8 and 24mm the lens performs excellently in the centre, although the sharpness towards the edges lags behind a fair bit. Stopping down to just f/4 produces excellent sharpness across the frame and peak quality is achieved at f/5.6.

At 35mm the centre sharpness at maximum aperture drops off a little but is still good and the resolution towards the edges still lags behind. Just as with 24mm, stopping down to f/4 results in excellent sharpness across the frame and peak quality is achieved at f/8.

Finally, at 70mm, the sharpness at maximum aperture drops off considerably and is below my expectations for a lens of this level. Still if you are happy to stop down to f/4, the quality across the frame improves dramatically and is very good across the frame. Peak quality is again achieved at f/8, where the resolution is excellent across the frame.

Resolution at 24mm Resolution at 35mm
Sigma 24-70mm f/2.8 EX DG HSM Resolution at 24mm Sigma 24-70mm f/2.8 EX DG HSM Resolution at 35mm
Resolution at 70mm How to read our graphs
The blue column represents readings from the centre of the picture frame at the various apertures and the green is from the edges. Averaging them out gives the red weighted column.

The scale on the left side is an indication of actual image resolution. The taller the column, the better the lens performance. Simple.

For this review, the lens was tested on a Nikon D700 using Imatest.
Sigma 24-70mm f/2.8 EX DG HSM Resolution at 70mm

Levels of chromatic aberration are kept below unacceptable levels throughout the zoom range. At their worst they cover 0.72 pixel widths at 24mm and f/2.8, which may show along high contrast edges towards the edges of the frame.

Chromatic Aberrations at 24mm Chromatic Aberrations at 35mm
Sigma 24-70mm f/2.8 EX DG HSM Chromatic Aberrations at 24mm Sigma 24-70mm f/2.8 EX DG HSM Chromatic Aberrations at 35mm
Chromatic Aberrations at 70mm How to read out charts
Chromatic aberration is the lens' inability to focus on the sensor or film all colours of visible light at the same point. Severe chromatic aberration gives a noticeable fringing or a halo effect around sharp edges within the picture. It can be cured in software.

Apochromatic lenses have special lens elements (aspheric, extra-low dispersion etc) to minimize the problem, hence they usually cost more.

For this review, the lens was tested on a Nikon D700 using Imatest.
Sigma 24-70mm f/2.8 EX DG HSM Chromatic Aberrations at 70mm

As I would expect for a wide aperture lens, falloff of illumination towards the corners can be quite pronounced. At 24mm and f/2.8 the corners are 2.51 stops darker than the image centre and the lens needs to be stopped down to f/5.6 to achieve visually uniform illumination. At 70mm and f/2.8 the corners are 2.2stops darker than the image centre and the lens also needs to be stopped down to f/5.6 for visual uniformity.

Distortion may pose issues for some at 24mm. Here Imatest recorded 6.41% barrel distortion, which is fairly typical if a lens of this type. At 70mm the barrel distortion is replaced with mild pincushion distortion. Here Imatest recorded 0.782% pincushion distortion, which shouldn't pose too many issues in normal photography. Luckily the distortion pattern is uniform throughout the zoom range, making it easy enough to correct in image editing software afterwards.

Click on the thumbnails for a high resolution image.
Sigma 24-70mm f/2.8 EX DG HSM @ 24mm   Sigma 24-70mm f/2.8 EX DG HSM @ 70mm
The resolution in the centre is excellent at every aperture at 24mm.   At other focal lengths, and especially at 70mm, the lens needs to be stopped down to f/4 for best results.

Flare and ghosting is reasonably well controlled under normal conditions. In extreme cases with strong point sources of light within the frame flare can be a problem, with patterns of flare littering the image. This is only really an issue in very extreme cases, such as shooting into stage lighting, or when the sun is very prominent in the frame. A petal shaped lens hood is supplied, which does an excellent job of shielding the front element from extraneous light.

DxOMark provides objective, independent, RAW-based image quality performance data for lenses and digital cameras to help you select the best equipment to meet your photographic needs.

Visit the DxOMark website for tests performed on the Sigma 24-70mm f/2.8 EX DG HSM.

Sigma 24-70mm f/2.8 EX DG HSM: Verdict
Summing this lens up in a paragraph or two is actually quite difficult, as it's almost like I've tested two completely different lenses at once. The first one being an f/2.8 zoom lens, which should be great for low light photography, but unfortunately falls slightly below par in terms of performance, especially at focal lengths beyond 35mm. Here the resolution at maximum aperture just isn't what you'd expect for a flagship lens from any lens manufacturer.

Now if I were to consider this lens as having a maximum aperture of f/4, it would be amongst the best performing lenses covering these focal lengths. Sharpness across the frame is excellent.

It's a shame this lens has this split personality as the build quality is generally very good, and the lens is very pleasant to use.

So in summary, if you were after a high performance f/2.8 lens, you may find better performance elsewhere. On the other hand, if your photography allows you to stop down to f/4 or smaller much of the time, then this lens is a superb performer.

Sigma 24-70mm f/2.8 EX DG HSM: Pros
Sigma 24-70mm f/2.8 EX DG HSMExcellent optical performance stopped down to f/4 and below
Sigma 24-70mm f/2.8 EX DG HSMGood build quality
Sigma 24-70mm f/2.8 EX DG HSMFast autofocus

Sigma 24-70mm f/2.8 EX DG HSM: Cons
Sigma 24-70mm f/2.8 EX DG HSMResolution at maximum aperture at focal lengths beyond 35mm
Sigma 24-70mm f/2.8 EX DG HSMBarrel Distortion at 24mm

FEATURES Sigma 24-70mm f/2.8 EX DG HSM
HANDLING Sigma 24-70mm f/2.8 EX DG HSM
PERFORMANCE Sigma 24-70mm f/2.8 EX DG HSM
VALUE FOR MONEY Sigma 24-70mm f/2.8 EX DG HSM
OVERALL Sigma 24-70mm f/2.8 EX DG HSM

Sigma 24-70mm f/2.8 EX DG HSM: Lens specification
Price £600.00
Contact www.sigma-imaging-uk.com
Filter size 82mm
Format Full Frame
Construction 14 elements in 12 groups
Angle-of-view 84.1 - 34.3 degrees
35mm equivalent focal length (on APS-C body) 36-105mm
Internal focusing Yes
Image stabilisation No
Minimum focus 38cm
Maximum aperture f/2.8
Minimum aperture f/22
Weight 790g
Size 88.6 x 94.7mm
In the box Lens Case, Lens Hood

The Sigma 24-70mm f/2.8 EX DG HSM costs around £600 and is available from Warehouse Express here:

Sigma 24-70mm f/2.8 EX DG HSM for Canon
Sigma 24-70mm f/2.8 EX DG HSM for Nikon
Sigma 24-70mm f/2.8 EX DG HSM for Sigma
Sigma 24-70mm f/2.8 EX DG HSM for Sony
Sigma 24-70mm f/2.8 EX DG HSM for Pentax


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Comments

Paulgc
Paulgc  3 England1 Constructive Critique Points
24 Sep 2011 - 9:42 AM

I purchased this lens as i was eager to use a quality F2.8 product, unfortunately F2.8 is a complete waste of time and i feel as though Sigma have conned me out of 600. All is not lost though because once you stop down to F4 then things improve enough to make using this lens justified.

I have had this lens for approx 6 months now and all though the range of apertures from f2.8 - f3.5 are not good i dont think i could part with the lens as it provides amazing sharpness and quality at most of the other apertures.

A lack of stabilisation is very missed and speeds of at least 1/125 are recommended to avoid camera shake issues. I have taken a couple of successful pictures hand held as low as 1/60 but on average a faster shutter speed is advised but try not to use f 2.8 to get those speeds up.

Auto focusing does have its niggles as the lens tends to focus either in front or behind of the point you want focused but this seems to occur more commonly at close ranges, although on average i have noticed that i delete more and more pictures due to focus errors than i have ever done with any other lens.

I really want to be chuffed with this lens but if i knew about all of its issues before buying the lens then i definately would not have purchased it. Having said that it does have a lot to offer and is a step up from the 18-55mm kit lens.

Finally, if someone offered me a good price for my mint condition 6 month old sigma lens then i would sell it, but until then i will keep using it as its better than my only other lens the 18-55 and i have no choice but to put up with it and adjust to its faults.

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