Tamron AF 17-50mm F/2.8 XR Di-II LD SP Aspherical (IF) Zoom Lens for Canon Digital SLR Cameras (Model A16E)

by Tamron

• 17-50mm aspherical zoom lens with f/2.8 maximum aperture for Canon DSLR cameras
• Delivers fast shutter speeds and natural soft-focus effect to produce sophisticated results
• 3 elements of XR glass, 2 hybrid aspherical lens elements, and 1 element of LD glass
• Minimum focus distance of 10.6 inches; internal coatings eliminate ghosting and flare
• Measures 2.9 inches in diameter and 3.3 inches long; weighs 15.2 ounces; 6-year warranty

Product Details

• Product Dimensions: 5.3 x 4.1 x 4.1 inches ; 1.2 pounds
• Shipping Weight: 2 pounds (View shipping rates and policies)
• Shipping: Currently, item can be shipped only within the U.S.
• ASIN: B000EXR0SI
• Item model number: AF016C-700
• Average Customer Review: 4.2 out of 5 stars  See all reviews (335 customer reviews)
• Date first available at Amazon.com: May 4, 2006

Product Description

Style: Canon

From the Manufacturer

The SP AF17-50mm F/2.8 is a lightweight, compact, fast standard zoom lens designed exclusively for digital SLR cameras, expanding the product concept of the popular SP AF28-75mm F/2.8 zoom lens. In addition, portrait shots are made beautiful with the natural out-of-focus effect characteristic provided by the fast F/2.8 aperture. Additionally, a broader photographic expression through the use of faster shutter speeds as a result of the maximum aperture offers enhanced photographic pleasure. The lens boasts one of the best close-up shooting performances in the class of fast standard zoom lenses designed exclusively for digital cameras and featuring an F/2.8 maximum aperture throughout the entire zoom range, to ensure stress-free photographic shots at all focal lengths and distances.

Extraordinary detail at the macro level

AF18-200mm F/3.5-6.3 XR Di II Highlights

Di II
Lenses are designed for exclusive use on digital cameras with smaller-size imagers and inherit all of the benefits of our Di products. These lenses are not designed for conventional cameras and digital cameras with image sensors larger than 24mm x 16mm.

Extra Refractive Index Glass (XR)
Extra Refractive Index (XR) glass can bend light rays at steeper angles, thereby decreasing the physical length of the lens while enhancing imaging performance by minimizing optical aberrations. This has allowed Tamron to develop a line of shorter, smaller-diameter, lighter lenses without sacrificing lens speed, and actually upgrading image quality compared to older designs. XR glass is costlier than conventional glass but it yields enhanced optical power distribution, making possible many of the outstanding and innovative lens designs that bear the XR designation. XR glass, with its superior light-bending power, makes it possible to design a short-barrel lens with the same light-gathering ability (aperture value) as a long-barrel lens—even with a smaller lens diameter. By using this principle Tamron has been able to shorten the length of the entire optical system and produce lighter, more compact lenses of the same speed, and also to provide greater zoom ranges in lenses that are much more convenient to carry by hand.

Special glass for better performance and more compact lens designs

Low Dispersion (LD)
Low dispersion (LD) glass elements in a lens help reduce chromatic aberration; the tendency of light of different colors to come to different points of focus at the image plane. Chromatic aberration reduces the sharpness of an image, but glass with an extremely lowdispersion index, has less of a tendency to separate (defract) a ray of light into a rainbow of colors. This characteristic allows the lens designer to effectively compensate for chromatic aberration at the center of the field (on axis), a particular problem at long focal lengths (the telephoto end of the zoom range), and for lateral chromatic aberration (towards the edges of the field) that often occurs at short focal lengths (the wide-angle end of the zoom range.)

Low Dispersion (LD) Glass for Greater Lens Sharpness

Super Performance (SP) for Discriminating Shooters
Tamron SP (Super Performance) series is a line of ultra-high-performance lenses designed and manufactured to the exacting specifications demanded by professionals and others who require the highest possible image quality. In creating SP lenses Tamron’s optical designers put their foremost priority on achieving superior performance parameters—they are all designed to a higher standard with little regard for cost constraints. As a result, Tamron lenses bearing the SP designation feature impressive and innovative designs that have established an enviable reputation for excellence among those knowledgeable photographers that demand the very best.

Zoom Lock (ZL)
Another original Tamron mechanical engineering concept is the Zoom Lock (ZL), a simple convenience feature that prevents undesired extension of the lens barrel when carrying the camera/lens unit on a neck strap.

Product Description

The Tamron SP AF17-50mm f/2.8 XR Di II LD Aspherical [IF] is a lightweight, compact, fast standard zoom lens designed exclusively for digital SLR cameras. The focal length of this lens is equivalent to approx. 26-78mm in 35mm format. This lens offers an f/2.8 maximum aperture throughout the entire zoom range, to ensure stress-free photographic shots at all focal lengths and distances. Additionally, a broader photographic expression through the use of faster shutter speeds as a result of the maximum aperture offers enhanced photographic pleasure. FEATURES: Optimized for Digital SLR - The use of XR (Extra Refractive Index) glass optimizes the overall distribution of optical power, and also reduces various aberrations to the absolute minimum while achieving remarkable compactness. In addition, suitable positioning of two hybrid aspherical elements serves to maintain imaging performance and to shorten and compress the entire optical system. LD Glass - An LD (Low Dispersion) glass element is used to accomplish effective compensation of on-axis and lateral chromatic aberrations, a critical factor for enhancing optical quality in digital photography, in order to achieve outstanding optical performance over the entire zoom range. Enhanced Peripheral Illumination - Peripheral light fall-off is minimized when compared with that of conventional lenses for film cameras, so images are uniformly bright from the center to the periphery. Internal Surface Coating to Reduce Ghosting and Flare - By employing "Internal Surface Coatings" (i.e., multiple-layer coatings on cemented surfaces of plural elements) and multiple-layer coating technology on ordinary elements, ghosting and flare due to the reflections that occur when light enters through the front element and

Most Helpful Customer Reviews

199 of 204 people found the following review helpful

5.0 out of 5 stars Talk about bang for your buck! October 8, 2006

By Tristan C.

Style Name:Canon|Amazon Verified Purchase

This is the kind of lens that makes me wish Canon would understand their market better. Instead of putting out a 17-55mm zoom that everyone can afford, they put out a EF-S non pro lens at a pro price, which has serious quality control issues. Tamron, however, responded.

This lens is quite sharp. It could definately be used for professional purposes. Sharp at 2.8 and much sharper above. After using this lens, the 17-40mm L, as well as the new EF-S 17-55mm, I can honestly say that Tamron beat out Canon in their own game in terms of quality for the money. Great optics, great range, affordable, and a SIX YEAR warranty, as opposed to Canon's weak 1 year warranty. Buy me.

265 of 284 people found the following review helpful

5.0 out of 5 stars Best wide angle zoom lens. July 19, 2006

By Linan Chen

Style Name:Canon

I tested canon 28-105 3.5-4.5, sigma 24-70 2.8, canon 50mm 1.8, canon 18-55 3.5-5.6. I would say this Tamron 17-50 2.8 is my dream lens. I bought canon 28-105 3.5-4.5 for the focal range but was very sad about its softness and returned it. Then I went to sigma. That's a huge, heavy lens and very solid. Based on reviews, it should be very sharp. however, it was not true in my case. No matter how hard I tried, I never got sharp image. I guess I was not lucky enough to have a good copy and returned it in one week. Finally I bought Tamron 17-50mm 2.8. It surprised me from the very first picture. The sharpness is as good as canon 50mm 1.8 prime, the benchmark. Contrast is very good and color too. 7 blade aperture makes very nice blur background. I care so much about sharpness so the lens is my taste. The focusing is very accurate and fast enough, even though not as fast as sigma. Now I never touch canon 18-55 kit lens, the difference is huge. It's true this lens has no IS. But for 17-50mm range, IS is not as useful as for tele lens. The price is excellent considering the top optical quanlity. Now I am feeling I am a pro. :)))

The reasons I choose this lens are:

1. widest angle in the class(most important thing for 1.6X cropping factor sensor camera
2. Very sharp and top quanlity glass
3. light weighted and small and easy to carry
4. 7-blade aperture makes nice background(if you own canon 50mm 1.8 II, you will see its 5-blade aperture makes harsh background)
5. big constant 2.8 aperture through the whole range
6. excellent price

137 of 149 people found the following review helpful

5.0 out of 5 stars How does it rate? More importantly how does it rank? July 8, 2006

By Abdulrahman Aljabri

Style Name:Canon

Update: I really think this lens is a godsend to the enthusiast, it performs well and is very light and compact. Carrying this lens for hours compared to the more professional and better built, but heavier, Canon Lenses makes it worthwhile to use especially if you consider the saving you get with this lens.

This lens is probably the most interesting among all the wide angel lenses available to Canon crop DSLR users. It offers the best of everything except for a couple of things here and there. Best of all it's price beats all other lenses in that range. But before I start comparing it to other options here is a basic rating of this lens.

RATING: The lens is well built and surprisingly light and compact. It doesn't have the solid L feel but still has a firm feeling that inspires confidence while shooting. Sharpness is at par with other top quality zooms, so much so that at F8.0 and above it matches many primes. Distortion like chromatic aberration and vignetting are about average. Meaning you would probably have to stop the lens down to 5.6-8.0 to eliminate distortions. Focus is quick and right on though a little noisy. Overall, a very good lens.

RANKING: With all of the above in perspective how does it rank? Compared to Canon's 17-40L 4.0 I think the Tamron come on top. Here is a breakdown of the Tamron strenghts and weaknesses compared to the Canon 17-40L.

Strengths
1. Faster lens (2.8 vs 4.0). That can make the difference between taking the shot or missing in a low light situation.
2. It has a wider zoom range (10mm at the telephoto end).

Weaknesses
1. Flare and chromatic aberration control lags behind the 17-40L.
2. solid build but not as solid as the tank-like 17-40L.... Some may find that slightly objectionable after using any L lens for many years. Read more ›

132 of 145 people found the following review helpful

4.0 out of 5 stars Great budget lens for upgrading your kit lens, but not as good as Canon's 17-55 IS December 24, 2008

By Raivyn

Style Name:Canon|Amazon Verified Purchase

Alot of people are choosing between the Tamron 17-50mm and the considerably more expensive Canon 17-55 IS. Canon obviously believes this focal length will appeal to the broadest group of consumers, hence why the 18-55 IS is included with the XSI kit. I personally have both the Canon 17-55IS and the Tamron 17-50 and like them both for very different reasons. There are alot of technical reviews that discuss barrel distortion, vignetting, etc, but my review is focused on how well the lens performs if you're a first time DSLR owner like myself who has barely a clue about photography.

What I like about the Tamron 17-50:
-Very small and lightweight. I have it mounted on my Rebel XT, so it makes for a very compact DSLR with a range great for wide angle shots and portraits of people.
-Images are VERY sharp, pretty comparable to the 17-55IS. I shoot in RAW, so I can't comment on color quality much.
-I like the lens cap; its easier than the Canon lens cap to remove while the hood is on.
-Barrel lock: you can lock the barrel so if the lens is stored facing down, it doesn't extend. My Canon 28-135IS does that, and it is annoying.
-It has a maximum constant aperture of 2.8. It is very difficult to find a zoom lens that is this fast for as price as low as this Tamron (the Tamron 28-75 being the other lens that comes too mind). Definitely, NONE of the fast Canon zoom lenses with a constant aperture are in that price category. I think the closest may be a f/4, of you're looking at consumer grade lenses that have apertures that change with the focal length (i.e. f/3.5-5.6).
-Price: It is less than half the price of the 17-55IS.... If you have the skill to coax the best out of the lens, your prudent purchase will reward you handsomely, and you'll have money left over to buy a nice camera body.

What I don't like about the Tamron 17-50 as compared to my 17-55IS:
-Autofocus isn't as precise as with the 17-55IS. I have a higher percentage of blurry photos with the Tamron than I do with the Canon.
-Focus ring turns in the opposite direction of the Canon lenses. This makes removing the lens kind of annoying.
-No IS. Some people say that you don't need IS at this focal range. But I do. Maybe I drink too much coffee, but I love IS. I have less blurry photos of my dogs using the 17-55IS than I do with the Tamron. I do get sharp photos with my Tamron, but you don't want to have to sort through literally hundreds of photos just to find a few sharp ones.
-Low light/indoor performance not as good as the 17-55IS. I've discovered I love photos with great depth of field/bohkeh, so I tend to shoot on wider apertures as often as possible. Even when its wide, the Tamron doesn't perform as well as the 17-55IS in low light situations. It is likely a result of a combination of its autofocus/lack of IS. If you're out and about on a sunny day, or are using a tripod, you will likely not experience this too much. But if you're inside on a rainy day, you'll notice this.

The Tamron 17-50 f/2.8 lens will certainly give you better photos than the kit lenses will. If you have a smaller DSLR like the Rebel XT, XTI, XS, or XSI, you'll appreciate the small size of the Tamron while giving you very sharp photos. However, I believe you need to have some skills in order to reap the benefits of this lens. Price is a considerable factor as well; you could purchase this lens and an XS body for about the price of the 17-55IS lens alone. We actually picked up this lens and highly discounted Rebel XT as our *small* camera because combined it was about the price of a G10. We bring our 40D w/17-55IS out when we want the low light performance, of we know we're going to take photos. We bring the XT/Tamron 17-50 combo out when we want a camera just-in-case, and we want the photos to be really good. We bring our Canon A570IS when we want something that's very small and don't really care about photos.

If you have the funds, or only want one lens, I would recommend the Canon 17-55 over this lens. It is better built (though its a considerably larger lens), has IS, and has the same optics that Canon's "L" series lens has. On average, the photos of family and friends that I take with the 17-55 turn out better and sharper (and I have fewer discards) than with the Tamron. My skill level is mediocre at best, so I need all the help I can get, and the Canon provides, while the Tamron emphasizes how bad I am at holding the camera steady, though it does reward me just enough that I kept it.

You won't go wrong with the Tamron lens, and for the money and size, it is a great lens. It is worth upgrading to this lens if you only have your kit lens. But keep in mind that after purchasing the Tamron, you'll still want the 17-55IS.

EDIT 12/9/11: I want to point out that Tamron seems to have recognized the consumer's preference for image stabilization (IS) or vibration control (VC), which I stated was one of the reasons I preferred the 17-55IS over the Tamron 17-50. Tamron now has a VC version of this lens.

I have not purchased it and still own both my 17-55IS and the 17-50, and I know there are plenty of reviews out there for it for those who are interested.

I have purchased a Tamron 18-250 that I've been using for a year now, and will hopefully post a review sometime this Christmas season. Read more ›