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  • Sigma 18-200mm f/3.5-6.3 DC AF OS (Optical Stabilizer) Zoom Lens for Canon Digital SLR Cameras
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Sigma 18-200mm f/3.5-6.3 DC AF OS (Optical Stabilizer) Zoom Lens for Canon Digital SLR Cameras

by Sigma

Available from these sellers.
  • 18-200mm high-zoom-ratio lens designed for Canon digital SLR cameras
  • 2 Special Low Dispersion (SLD) glass elements and 2 hybrid aspherical lenses
  • Lens coating reduces flare and ghost; 17.7-inch close focusing distance
  • Inner focusing system is suitable for circular polarizing filters and lens hoods
  • Measures 2.75 inches in diameter and 3.07 inches long; 1-year warranty
7 new from $419.92 17 used from $239.49

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Technical Details

  • Brand Name: Sigma
  • Model: B000NOSCGM
  • Lens Type: Zoom lens
  • Mounting Type: Canon SLR
  • Minimum focal length: 18 millimeters
  See more technical details

Read about our customers' top-rated lenses and cameras on our review pages: Lenses, Digital SLR Cameras, Compact System Cameras

Product Details

  • Product Dimensions: 98 x 79 x 3.1 inches ; 1.3 pounds
  • Shipping Weight: 2 pounds
  • Shipping: Currently, item can be shipped only within the U.S.
  • Item model number: B000NOSCGM
  • Average Customer Review: 4.1 out of 5 stars  See all reviews (93 customer reviews)
  • Date first available at October 2, 2001

Product Description

The Sigma 18-200mm high-zoom-ratio lens is designed exclusively for Canon digital SLR cameras and is capable of covering a wide range of focal lengths, from wide-angle to telephoto. Two Special Low Dispersion (SLD) glass elements and two hybrid aspherical lenses correct for all types of aberrations, letting Sigma house the extended-range super-zoom lens in a compact and lightweight body that measures 70mm in diameter and 78.1mm long and weighs a mere 14.3 ounces. The new lens coating, meanwhile, reduces flare and ghost--a common problem shared by many digital cameras--while also creating an optimum color balance. Other details include a minimum focusing distance of 45cm (17.7) at all focal lengths, a high zoom ratio of 11:1, and a maximum magnification of 1:4.4.

The lens design incorporates an inner focusing system that prevents the front of the lens from rotating, making it particularly suitable for using circular polarizing filters and petal-shaped lens hoods. In addition, the overall length of the lens never changes during focusing, making the lens convenient to handle and easy to use. Finally, the lens's zoom lock switch eliminates "zoom creep" during transport--a convenient addition when traveling. The lens, which includes a metal mount, is backed by a one-year warranty.

Product Description


  • Sigma’s own unique technology OS (Optical Stabilizer) function
    The 18-200mm f3.5-6.3 OS is equipped with Sigma’s own unique OS (Optical Stabilizer) technology.  This system uses two sensors inside the lens to detect vertical and horizontal movement of the camera by moving an optical image stabilizing lens group, to effectively compensate for camera shake.  It also automatically detects panning movement of the camera and compensate for camera shake when shooting moving subjects such as motor sports.
  • Excellent Optical Performance
    A Special Low Dispersion (SLD) lens and three aspherical glass elements provide excellent correction for all types of aberrations and produce a high level of optical performance throughout the entire zoom range.  The super multi-layer lens coating reduces flare and ghosting while producing the best color balance.
  • Enables close-up photography 
    This lens has a minimum focusing distance of 45cm through entire zoom range with a maximum magnification of 1:3.9 making it very convenient for taking close-up pictures.
  • Inner focusing system
    Because the front of the lens does not rotate, circular polarizing filters and a petal-type hood can easily be used.
  • Magnification scale
    A magnification scale is displayed on the lens barrel, ensuring ease of use.
  • Zoom lock switch mechanism
    A zoom lock switch mechanism is provided to prevent the lens from creeping due to its own weight.

Customer Questions & Answers

Customer Reviews

The zoom ring is a little stiff, but not too stiff.
Baltic Books
The lens works very well creating sharp images in challenging situations.
Great all-in-one lens and I'd recommend it to anyone.

Most Helpful Customer Reviews

339 of 343 people found the following review helpful By Baltic Books on July 26, 2007
Verified Purchase
We've been using this Sigma AF 18-200 lens for a couple of months now. Recently we compared the Sigma with Canon's 28-135mm image stabilized lens on a Canon 30D. We shot side by side photographs at 28mm & 135 mm both, set to ISO 100 with camera in Program mode. Our lenses were set to autofocus with image stabilization on.

The good news which I really didn't expect was to see both lenses produce images that were nearly identical-- I thought for sure Canon's optics would far surpass Sigma's. Color saturation, light exposure through the lens, and detail were indistinguishable. The autofocus worked equally well on both. Both weighed about the same and were about the same size. The Sigma has a 72mm diameter aperture which I liked (so does the Canon). Of course the Sigma is 18-200, and at this time Canon does not have a competing option in the same digital SLR lens class with image stabilization.

The only aspect of the Sigma that differed significantly from Canon's lens was the noise of Sigma's autofocus motor. Sigma produces noticeable motor noise, though it wasn't overly loud. Still if you were shooting in a spot where silence was critical such as a ceremony, it may become an issue but probably not. In comparison, the Canon autofocus motor is silent and fast every time.

Sigma places a locking mechanism on the lens barrel to eliminate any possibility of lens creep (lens extending when pointed down). I doubt this would be a problem with the Sigma anyway. The zoom ring is a little stiff, but not too stiff. The manual focus ring is designed to be used with AF set to off to avoid manipulating the motor when focusing.

The image stabilization works well allowing you to shoot lower light photos without a tripod.
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58 of 60 people found the following review helpful By Michael Morgan on November 13, 2008
Verified Purchase
I've had the Sigma 18-200mm OS lens for several months and found it to give sharper images with my 40D than the Tamron 18-250mm (non-IS/OS) which it replaced. Then along comes the new Canon EF-S 18-200mm f/3.5-5.6 IS, their own superzoom "travel lens." I bought one to see how it compares to the Sigma. My tests show mixed results regarding image quality. With both lenses wide open the Sigma wins at the wide end from 18-24mm, especially away from the center, while the Canon wins at the 135-200mm long end, also especially away from the center. The Sigma is f6.3 wide open at 200mm while the Canon is f5.6. This is only a small difference, but it does give the Canon even more advantage at 200mm where shutter speed needs to be the highest.

Both lenses auto-focus accurately (no front or back focus) although the Sigma is slower to lock focus in low light and is a little noisier in getting there. Their IS/OS are equally effective at about 3 stops of compensation. Build quality, size and weight are about the same and both use the same 72mm filter size. Sigma includes a lens hood while Canon wants to sell you one.

In summary, the Canon is slightly better for me due to the faster and quieter low-light focus and improved telephoto image quality. The trade-off is poorer image quality than the Sigma for wide angle shots, even after stopping down. Finally, the Sigma lens costs about $200 less than the Canon at this time.
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30 of 30 people found the following review helpful By Tremelune on January 9, 2008
Verified Purchase
This lens is phenomenal. It is the perfect walk-around lens. 28-300mm lenses don't compete, as I find the 18-28mm range to be far more useful than the 200-300mm range for APS-C sensor cameras like the Rebel and 40D. Sigma has an 18-250mm lens, but its lack of image stabilization is a deal-breaker. This lens isn't too heavy, isn't too large, and it zooms like a bastard. If I had to have one lens for an APS-C sensor camera, with cost as no object, this would be it. Second would be Canon's 10-22mm. I would pay big bucks for a faster version of this lens.
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19 of 19 people found the following review helpful By dredman1 on April 9, 2009
Verified Purchase
I bought this lens as a Christmas gift for my wife to use with her Rebel XTi about 4 months ago. When I got it, I was extremely happy with the quality and build of the lens. It has a nice matte black finish, and feels extremely rugged and sturdy.
The OS worked great too, reducing blur in handheld situations up to 3 stops for me, maybe more for someone who can hold steadier than I can.
My wife LOVES the lens, since her shooting patterns entail her shooting at wide angles (landscapes) and then she may suddenly switch to shooting at moderate to high zoom (abstract images of objects etc), and then back again.
Before this lens, she would have to constantly switch from her 18-55 kit lens to her Canon 70-300 IS USM lens and back again, or just miss the shot because it wasn't practical to switch at the time.
The Sigma changed that. Now her kit lens is practically obsolete, since this lens has the 18-55 focal range, AND it has optical stabilization, which her kit lens doesn't.
Some of the reviews of this lens mention aberrations, pin cushioning and light falloff at extreme focal ranges, but we saw no signs of that. In fact, the images at 18mm on this lens appeared sharper and brighter than with the Canon kit lens.
As a serious hobbyist, she couldn't be happier with the lens.
However, after using the lens for a couple weeks, she began getting an occasional "Err99" message on her camera. We isolated it to the lens, since she had 4 other lenses - the 2 Canons and 2 Sigmas (a 55-200mm and a 10-20mm), and in the 15 months she owned her camera, she never got that error with any of the other lenses.
I wrote Sigma about it and they were very apologetic and helpful.
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