10-20mm F3.5 EX DC HSM

Ultra wide-angle zoom lens with a large, constant aperture of F3.5, designed specifically for digital SLR cameras

This Ultra wide-angle zoom lens has a maximum aperture of F3.5 throughout the entire zoom range, making it suitable for low-light and indoor photography. It’s wide-angle of view from 102.4*degrees produces striking images with exaggerated perspective, enabling photographers to emphasize the subject. ELD (Extraordinary Low Dispersion) glass, SLD (Special Low Dispersion) glass and aspherical lenses provide excellent correction of all types of aberrations. The super multi-layer lens coating reduces flare and ghosting and creates high image quality throughout the entire zoom range. The HSM (Hyper Sonic Motor) ensures fast and quiet autofocus, while allowing full-time manual focus override.

*The angle of view changes depending on which camera model the lens is attached to.

Ultra wide-angle zoom from 102.4* degrees

The 10-20mm F3.5 EX DC HSM lens offers photographers greater freedom of expression by rotating the zoom ring. It is a very powerful tool for architectural, indoor and landscape photography.

*The angle of view changes depending on which camera model the lens is attached to.

Exaggerated perspective

This ultra wide-angle lens allows photographers to create an exaggerated perspective between the subject and the background to emphasize, for example, expanses of a landscape.

Large F3.5 aperture through the entire zoom range

The large, constant aperture of F3.5 provides a bright image in the viewfinder, which helps photographers easily check focusing and composition.

Superior image quality

Two ELD (Extraordinary Low Dispersion) and one SLD(Special Low Dispersion)glass elements are employed for effective compensation of color aberration. The use of two glass mold and two hybrid aspherical lenses offer excellent correction for distortion and astigmatism and assure superior image quality. The super multi-layer coating reduces flare and ghosting and provides high contrast images throughout the entire zoom range.

Quiet and fast AF

This lens incorporates HSM (Hyper Sonic Motor), which ensures a quiet and high-speed auto focus as well as full-time manual focus override by rotation of the focus ring.*

*AF will not function with Pentax ist* series and K100D DSLR cameras that do not support HSM.

Petal-type Hood

An inner focusing system eliminates front lens rotation, making the lens particularly suitable for using the included petal-type lens hood which blocks out extraneous light.

Minimum focusing distance of 24cm (9.4") at all focal lengths

This lens has a minimum focusing distance of 24cm (9.4 inches) throughout the entire zoom range. This close focusing distance on such a wide-angle lens emphasizes perspective and allows the photographer to capture high quality images, not only of the foreground subject but also the surrounding scenery.

*Vignetting will occur if the lens is used with digital cameras with image sensors larger than APS-C size or 35mm SLR cameras.

Ultra wide-angle zoom lens with a large, constant aperture of F3.5, designed specifically for digital SLR cameras

Lens construction



10-20mm F3.5 EX DC HSM

Lens Construction 13 elements in 10 groups
Angle of View (for SD1) 109.7 – 70.7 degrees
Number of Diaphragm Blades 7 Blades (rounded diaphragm)
Minimum Aperture F22
Minimum Focusing Distance 24cm / 9.4in
Maximum Magnification 1:6.6
Filter Size Diameter 82mm
Dimensions Diameter 87.3mm x Length 88.2mm / 3.4in. x 3.5in.
Weight 520g/ 18.3oz.

Corresponding AF Mounts

Barcode No.

Sigma 00-85126-202569
Canon 00-85126-202545
Nikon 00-85126-202552
Sony A-Mount 00-85126-202620
Pentax 00-85126-202613

Ultra wide-angle zoom lens with a large, constant aperture of F3.5, designed specifically for digital SLR cameras

MTF chart









Ultra wide-angle zoom lens with a large, constant aperture of F3.5, designed specifically for digital SLR cameras

In the news

‘Generally the 10-20mm f/3.5 Sigma zoom lens lives up to the expectations for an optic of this specification and price range. In terms of resolving power/contrast, results showed the usual improvement as focal length increased and the viewing angle narrowed.’ ‘There are four aspheric elements rather than three, and the diaphragm is seven bladed rather than six. This will improve shapes in out-of-focus areas, giving better bokeh.’

‘Packed with SLD (Super Low Dispersion), ELD (Extraordinary Low Dispersion) and aspherical lens elements, there’s no shortage of quality materials in the Sigma lens. Taking the whole zoom range into account, the Sigma gives the best and most consistent performance for fringing of any lens on test. All the refinements of the Canon lens, but with better image quality. It’s much cheaper than the Canon lens, but image quality is superior.’

‘There’s certainly a lot to like about this lens, including a maximum aperture of f/3.5 that remains constant throughout the zoom range. Build quality feels pretty good and appealing extras include HSM autofocus with full-time manual override. As the second-cheapest lens in the group, the Sigma 10-20mm has a lot going for it.’

‘About a year ago, when Sigma’s variable aperture (f/4-5.6) 10-20mm zoom was tested, a doubt was expressed about whether the then-forthcoming f/3.5 lens would be much better optically. The answer is a definite yes: the latest version has stunning resolution and performs brilliantly in real-world use. In short, this is an absolute gem that deserves a place on every photographers wish-list.’

‘The Hyper Sonic Motor (HSM) on my Nikon-fit lens delivers fast and quiet autofocus and the matte black EX finish ensures that this is an attractive looking lens with a quality feel about it. Chromatic aberration is also well controlled. Sharpness is also good, particularly around the centre of the frame. Overall, the lens performs very well. If you are looking to buy your first ultra wide-angle lens, this is a genuine contender. Build quality is excellent and the results are impressive.’

‘The geometry of the lens is very good across the full range from 10 to 20mm. The HSM focusing is wonderful and seems to give much finer settings with wide-angles lenses than screw focus. The lens itself is superbly built, it’s not as prone to flare as the older design, it deserves the EX label.’

‘It’s more resistant to into-the-light flare, and offers better drawing for architectural interiors. Central sharpness is excellent even wide open. For reportage-style shots in clubs, carnivals and similar crowded low-light events the centre of the frame may be all that matters and f/3.5 will make a difference.’

‘So where’s the attraction? Simple: it’s faster. Offering a consistent f/3.5 aperture throughout the entire zoom range, this lens is a dream for lovers of low light photography. Unsurprisingly, the built-in Hyper Sonic Motor (HSM) delivered fast and quiet autofocus. The minimum focusing distance of 24cm was impressive, helping to accentuate foreground interest and encourage the exaggerated perspectives loved by wide angle aficionados.’

‘The Sigma is a very sharp indeed centrally, even wide open. It has slightly lower distortion than the Nikon at 10mm. It comes in at around £100-150 cheaper than the Nikon, but nowhere near the low cost of the older Sigma. It is without doubt one of the best handling and looking of all these lenses. …if you are a Canon system user, you don’t have access to the Nikon, and the Sigma is so much more solidly built and faster at the long end than the 2004 EF-S USM Canon 10-22mm alternative.’

‘As the second-lowest priced lens in our test, the Sigma 10-20mm takes the top-spot, which just goes to show that the most expensive option doesn’t always mean the best. Sigma’s near-silent JSM focussing was the fastest and quietest, and because it’s in the lens, it’ll work on cameras without focussing motors too. For its all-round performance and image quality, this lens is deserving of our converted Digital Photo Gold Award.’

‘The zoom ring turns with a smooth motion throughout its short, approximately 60-degree range. There is a dedicated switch to select manual or auto focus. Zoomed out to 10mm and wide open at f/3.5 the Sigma is considerably better than the Tamron.’

‘The Sigma 10-20mm is a lot cheaper and has a slight advantage in specifications too, woth an f/3.5 maximum aperture across the zoom range. It’s well made too, with firm but smooth zoom and focus rings and a durable finish.’

‘Sigma has surprised us with the quality of its older 10-20mm f/3.5. We’ve tested this lens in the past and been generally impressed. It outclassed all other competitors in terms of sharpness. Couple this with the fact the price has dropped considerably over the last year – at least, it has in the UK and it’s an outright winner.’

There’s a lot to love about the Sigma 10-20mm f/3.5. It has sturdy build quality, great handling characteristics, fast and whisper quiet autofocus and a reasonably wide f/3.5 constant aperture design. Indeed, sharpness across the whole image frame is better than from any other lens in the group, throughout the zoom range. Overall, it’s a superb lens which has now become great value for money to boot.

Sigma’s 10-20mm f/3.5 gets top marks for features and build, offering a constant f/3.5 aperture at both ends of the zoom. With image quality as solid as its hardy build, Sigma’s 10-20mm f/3.5 is a great lens, worthy of our Silver Award.

Sharpness and contrast are excellent from this lens, beating everything else in the test group.

Overall it’s a superb lens, which has now become great value for money to boot. The Nikon 10-24mm delivers good image quality and eases ahead of its Canon 10-22mm rival for corner-to-corner sharpness. Even so, each is outperformed by the Sigma 10-20mm, and both look rather poor value by comparison. An excellent lens at a great price, this Sigma is clearly the pick of the Crop.

Ultra wide-angle zoom lens with a large, constant aperture of F3.5, designed specifically for digital SLR cameras


Lens Hood for 10-20mm F3.5 EX DC HSM

Item No. 202E23