DC is the Sigma denomination for lenses that only fit Aps-c cameras (but not full frame) like the D3200, the 650D/T4i and the K-5 II.

Sigma 18-35mm F/1.8 DC HSM Art on the web, hands-on previews and sample images...

While most of the previews are based on pre-production models, a small Korean web page posted several sample images taken with the new lens, mounted on both APS-C size cameras and Full frame  (Canon EOS 600D and EOS 5D Mk II)

DPreview hands on "Overall though the 18-35mm F1.8 is certainly an intriguing product, and we applaud Sigma for pushing the boundaries of lens design ahead of the more conservative camera manufacturers. It's a lens we think is worth investigating in more detail, and we'll be reviewing it just a soon as we can lay our hands on a shootable copy. Until then you can read more about the lens's design and operation on the next page of our preview."

PhotographyBlog hands on "We’ve been lucky enough to have some hands-on time with the new Sigma 18-35mm F1.8 DC HSM ahead of it launch. . . . read more

Sigma 18-35mm F/1.8 DC HSM Art lens, the first zoom lens featuring f/1.8 throughout the entire zoom range

Press release: RONKONKOMA, NY, Apr. 18, 2013 — Sigma Corporation of America (www.sigmaphoto.com), a leading researcher, developer, manufacturer and service provider for some of the world's most impressive lines oflenses, cameras and flashes, today announced the Sigma 18-35mm F1.8 DC HSM Art lens, the market’s first zoom lens to achieve a maximum aperture F1.8 throughout the entire zoom range.

This revolutionary, wide aperture, standard zoom lens is created for DSLR cameras with APS-C size sensors, which translates to a focal range of 27-52.5mm on a 35mm camera. With a minimum focusing distance of 11 inches, and a maximum magnification ratio of 1:4.3, the 18-35mm is ideal for landscapes, portraits, still-life, studio, close-up and casual photography. . . . read more

First Look at the new Sigma 17-70mm F2.8-4.0 DC Macro HSM 'Contemporary series' lens at the Sigma blog.

Sigma's spectacular first entry in the 'Art series' family of lenses was the fabulous 35mm f/1.4 DG HSM, a lens that took the photographic community by storm. Having now set the bar very high, can the company repeat the success with the (soon to be released) comparatively cheaper and lower spec'd​ 17-70mm F2.8-4.0 DC Macro HSM​? Jack Howard​ writes:

"On APS-C cameras, the lens translates to about a 26-112mm zoom, which is a great everyday range for wide angle shots without significant perspective distortion, to short telephoto for flattering portraits. For the exact focal length equivalence, multiply your camera’s sensor format (1.5 to 1.7) times the focal lengths. . . . read more

Sigma APO 50-150mm f/2.8 EX DC OS HSM Lens review by Bobby Zhang at the Phoblographer: At the popular 50-150mm focal range, this lens can be used for close portraits or for far-reaching sports, making it one of the more versatile lenses out there.

The Lens was tested with a Canon OS Rebel T3i/600D body. Kudos to Bobby for the intact EXIF information in his images.

"Designed for cropped sensor cameras, the Sigma 50-150mm OS works wonders when it comes to speed. At an awesome f2.8 aperture, this lens becomes much more flexible to fit your shooting needs and environment. Whether it is outside on a bright day or indoors in a poorly lit hockey rink, the images are clear and sometimes even surprisingly so.With a slightly higher $999 price tag, this Sigma lens costs much more than your average glassware but it is also appropriately priced. For the performance from the HSM and OS which combines to produce stellar images, it is difficult to not want one in your own bag. At the popular 50-150mm focal range, this lens can be used for close . . . read more

Sigma 50-150mm f/2.8 EX DC OS HSM APO review at SLR Gear: Quite simply, one of the sharpest zoom lenses we have had the opportunity to test.

"Sigma has a habit of identifying shortcomings in the lens offerings by other camera manufacturers and exploiting them: in 2006, with the introduction of the first 50-150mm ƒ/2.8 DC, it managed a coup, offering a 70-200mm experience for the APS-C camera. Sigma has certainly managed to improve on the initial and subsequent redesign of that lens, in the current optically-stabilized implementation. It's one of the sharpest telephoto zoom lenses we have ever tested, and should warrant serious consideration by photographers shooting with APS-C sensor-based cameras. Not only will you have . . . read more

Sigma 18-250mm f/3.5-6.3 DC Macro OS HSM review at DPReview: Best lens in the Dsrl travel ultra zoom game.

"The Sigma 18-250mm f/3.5-6.3 DC Macro OS HSM fits the bill nicely; it's compact, has decent enough optics, offers fast autofocus and effective image quality, and tops this all off with impressive close-up ability. We'd be inclined to conclude that it's the best-rounded general-purpose SLR lens currently on the market." . . . read more

Sigma announces trio of new lenses, new naming scheme, and a promise of improved quality control.

Maybe some other makers of expen$ive lenses *cough* CaNikon *cough* should also look into the 'quality control measures' thingie.

Sigma Press Release

Sigma Corporation announces reorganization of lens lineup, new products and quality control measures . . . read more

Sigma 18-250mm F3.5-6.3 DC Macro OS HSM announced, should be able to take the heat.

 What's the point of making a lens 'heat-resistant' but not otherwise weather resistant? Sigma thinks there's a reason. The lens will come in Sigma, Sony, Nikon, Canon and Pentax mounts, and it's price will hover around the $/£/€ 500 mark. Sigma has put up a nice 16 image gallery here. . . . read more

Sigma 50-150mm f/2.8 II EX DC HSM Lens Review at The Digital Picture

"When manually focused, the Sigma 50-150mm f/2.8 II EX DC HSM Lens performs obviously better. Wide open aperture (f/2.8) images are soft - especially at the 50mm and 150mm ends of the focal length range - at f/2.8. Images shot wide open at the focal length extremes are especially soft and contrast at 150mm f/2.8 is poor. Midrange focal lengths become reasonably sharp at f/4 while the ends of the focal length range (especially 150mm) are still improving at f/5.6.

. . . read more

Sigma 18-200 mm f/3.5-6.3 II DC OS HSM lens review @ LensTip

A value oriented all-rounder lens that's available in a lot of mounts:

"Perhaps the most important question this review should answer is whether the new model of the tested lens is better than its predecessor. The answer seems to be positive. The resolution of the new lens is similar to that of the older model; the chromatic aberration, distortion on wide angle, . . . read more

Sigma 18-200mm f/3.5-6.3 DC OS review at photodo

"At 100mm long and with a diameter of 79mm, this 18-200mm is a little chunkier than your standard kit zoom, and weighing 610g it is a fair bit heavier too. This is to be expected when the huge zoom range is considered and also the build quality, which is better than you'd expect on many third party lenses of this ilk. High quality plastics have been used throughout and an attractive matt powder coating has been . . . read more

Sigma 17-50mm f/2.8 EX DC OS HSM Lens Review at The Digital Picture

"For many, their first general purpose lens is the one available in-the-box with their first DSLR. While the kit lens is very economical, it is also the source of many emails I receive - especially when being used indoors without a flash. If there is any subject movement, the max aperture available on these lenses is not wide enough to allow the action to be stopped - resulting in motion-blurred images. . . . read more

Sigma 8-16mm f/4.5-5.6 DC HSM review at photodo

"For a lens with such a wide field of view, this 8-16mm optic is surprisingly compact and lightweight and Sigma have achieved this without compromising the overall build quality. Much of the lens barrel is constructed from high quality plastics with a powder coated effect applied, which looks very smart, but can show marks easily. Both the zoom and focus rings are flush to the lens barrel, with ridged rubber

. . . read more

Sigma 30mm f/1.4 EX DC review at photodo

"As an EX lens, the finish is the same matt black, hard-wearing surface as the remainder of the EX series lenses and comes supplied in the zipped stiff pouch along with lens and mount caps and a petal shaped ‘perfect’ hood. As with all the newer small pouches, it is fitted with a belt loop, making it a useful accessory. The hood is finished to match the lens.

Controls on the lens are simple, consisting of a switch on the left side for AF/MF (except Nikon) and a . . . read more

Sigma 18-50mm f/2.8-4.5 DC OS HSM review at photodo

"This lens is largely constructed from plastic with a brass lens mount. The exterior has a powder coated finish typical of Sigma lenses. This finish adds a quality feel to the lens when new, but in my experience it soon marks with normal use. Much of the lens barrel is taken up by the zoom and focus rings, which have nice wide rubber grips on them. The focus ring rotates during autofocus and can sometimes catch fingers

. . . read more

Sigma 50-200mm f/4-5.6 DC OS HSM review at photodo

"After purchasing a DSLR, many people will add a telephoto zoom to their kit bag at some point in time. Priced at £200 with optical stabilisation included, which promises to tame camera shake, this lens is bound to be a popular choice for those looking to extend their zoom range beyond the standard 18-55mm kit lens. This lens is very compact for its focal length and will suit those wishing to travel light . . . read more

Sigma 10-20mm f/3.5 EX DC HSM review at photodo

"Typical of Sigma's EX line of lenses, this optic feels well put together and the fit and finish is excellent. Much of the lens barrel has a powder coating applied to it, which certainly looks the part when new. The section close to the the lens mount, which is different depending on the camera type it is meant to be fitted to, doesn't have the same powder coating on the sample provided for review. Although the . . . read more

Sigma 10mm f/2.8 EX DC HSM Diagonal Fisheye review at photodo

"A wide aperture diagonal fisheye for APS-C sensor cameras, which offers an angle of view of 180 degrees from corner to corner.

Sigma's 10mm diagonal fisheye has a bright maximum aperture of F/2.8, Hyper Sonic Motor (HSM) focusing and costs around £500 and is available to fit Canon, Nikon and Sigma cameras.

Tokina are currently the only other third party manufacturer offering a diagonal fisheye for APS-C sensors . . . read more

Sigma 10-20mm f/3.5 EX DC HSM Lens Review at The Digital Picture

"Use the widest focal length you have available in your kit (perhaps 18mm or 24mm) to closely match one or more of the above focal lengths and base your own comparison on that selection. When deciding which focal length range is best for you, consider the lens(es) you already have and how the ultra-wide angle zoom focal length range aligns with it. Also consider

. . . read more

Sigma 10-20mm f/4-5.6 EX DC review at photodo

"This lens is designated to, and joins Sigma’s EX range. It therefore comes with the three year UK warranty and is shipped with a lens hood in a zip-topped pouch of the type that now sports a belt loop. The finish is the hardy matt black that we've praised before. Canon and Sigma mounts sport the usual AF/MF switch while the Nikon hasn't. Both are straight in front of the mount. The remainder of the barrel is split approximately into thirds, the first and last third being occupied by zoom ring and focus ring. The zoom ring is marked at 10, 12,14, 17 and 20mm. Zooming extends the lens length by barely 5mm, so a zoom lock would be

. . . read more

Sigma 18-200mm f/3.5-6.3 DC OS review at photodo

"This lens is surprisingly solid in its construction and is heavier again by half than its non-OS sibling. The difference is not just from the OS system though, with a better overall feel to it that encourages confidence in its abilities. Not that the lens is heavy, but it is certainly no plastic fantastic!

Two substantial, rubber embossed rings, one to operate the zoom and the other for manual focussing

. . . read more

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