Tamron Af 17 50mm F 2 8 Xr Di Ii Ld Sp Zl

The Tamron SP AF17-50mm f/2.8 XR Di II LD Aspherical [IF] is a lightweight, compact, fast usual zoom lens designed altogether 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 greatest or most complete or best possible aperture allround the entire zoom range, to assure stress-free photographic shots at all focal lengths and distances. Additionally, a broader photographic expression through the use of more quickly shutter speeds as a result of the greatest or most complete or best possible aperture offers intensified 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 respective aberrations to the sheer minimum while achieving noteworthy compactness. In addition, suitable positioning of two hybrid aspherical parts serves to maintain imaging performance and to shorten and compress the entire optical system. LD Glass – An LD (Low Dispersion) glass element is employed to accomplish effective compensation of on-axis and lateral chromatic aberrations, a critical factor for heightening optical quality in digital photography, in order to achieve great optical performance over the entire zoom range. Enhanced Peripheral Illumination – Peripheral light fall-off is minimized when equated 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 popular elements, ghosting and flare due to the reflections that occur when light enters through the front factor and

• Color: black
• Brand: Tamron
• Model: AF016C-700
• Released on: 2006-03-08
• Dimensions: 4.10″ h x 4.10″ w x 5.30″ l, 1.25 pounds

• 17-50mm aspherical zoom lens with f/2.8 greatest or most complete or best possible aperture for Canon DSLR cameras
• Delivers fast shutter speeds and natural soft-focus effect to construct sophisticated results
• 3 constituents of XR glass, 2 hybrid aspherical lens elements, and 1 factor 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

The SP AF17-50mm F/2.8 is a lightweight, compact, fast standard zoom lens designed totally for digital SLR cameras, expanding the product conception of the usual SP AF28-75mm F/2.8 zoom lens. In addition, portrait shots are made beauteous 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 more quickly shutter speeds as a result of the greatest or most complete or best possible aperture offers heightened photographic pleasure. The lens boasts one of the best close-up shooting performances in the class of fast frequent zoom lenses designed altogether for digital cameras and featuring an F/2.8 greatest or most complete or best possible aperture allround the entire zoom range, to see to it 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 gains of our Di products. These lenses are not designed for conventional cameras and digital cameras with effigy sensors more spectacular than 24mm x 16mm. Extra Refractive Index Glass (XR) Extra Refractive Index (XR) glass may bend light rays at steeper angles, thereby decreasing the physical length of the lens while heightening imaging performance by minimizing optical aberrations. This has permitted Tamron to create a line of shorter, smaller-diameter, lighter lenses without sacrificing lens speed, and genuinely upgrading effigy quality equated to older designs. XR glass is costlier than established glass but it yields heightened optical power distribution, making possible a good deal of of the outstanding and innovative lens designs that bear the XR designation. XR glass, with it is superior light-bending power, makes it possible to design a short-barrel lens with the same light-gathering capacity (aperture value) as a long-barrel lens—even with a littler lens diameter. By using this principle Tamron has been capable to shorten the length of the entire optical scheme and give rise to lighter, more compact lenses of the same speed, and also to provide dandier zoom ranges in lenses that are much more commodious to carry by hand. Special glass for better performance and more compact lens designs Low Dispersion (LD) Low dispersion (LD) glass constituents in a lens aid reduce chromatic aberration; the tendency of light of dissimilar colors to come to dissimilar points of focus at the effigy plane. Chromatic aberration reduces the sharpness of an image, but glass with an exceedingly lowdispersion index, has less of a tendency to distinguished (defract) a ray of light into a rainbow of colors. This characteristic allows the lens architect to efficaciously pay for chromatic aberration at the center of the field (on axis), a peculiar problem at long focal lengths (the telephoto end of the zoom range), and for lateral chromatic aberration (towards the edges of the field) that oftentimes 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 fabricated to the exacting specifications demanded by masters and others who require the most eminent possible effigy 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 frequent with little regard for cost constraints. As a result, Tamron lenses bearing the SP identification feature impressive and progressed designs that have established an enviable reputation for excellency among those welleducated photographers that demand the very best. Zoom Lock (ZL) Another introductory Tamron mechanical engineering science conception is the Zoom Lock (ZL), a simple comfortableness feature that prevents undesired extension of the lens barrel when carrying the camera/lens unit on a neck strap.

129 of 132 people found the following review helpful.
Talk about bang for your buck!
By Leetsauce
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.

215 of 228 people found the following review helpful.
Best wide angle zoom lens.
By Linan Chen
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

104 of 111 people found the following review helpful.
This len has lots of potential, but quality control is questionable
By orangejulio
I felt like I was taking a gamble when I bought this lens, because I was not able to find many reviews of it. Given that the equivalent Nikon was almost 3x the price, I decided to take a chance. At this point I still can’t give a solid thumbs up or down, so I opted to give it a 3. Here is a short history of my experience:

1) Bought lens from Amazon to use on my D50. It was a joy to have an f/2.8 zoom lens, but I was not totally convinced about the sharpness (which the few reviews I could find said was supposed to be really good). After comparing it to my other lenses and a rented Nikon 17-55 f/2.8 (great lens, but much bulkier and heavier), I determined that it front-focused so much that the subject would always be very slightly out of focus. It wasn’t obvious right away, because the front-focusing meant that the background went out of focus really quickly, making for a great depth-of-field effect. The heavily out of focus background essentially made the subject look more focused, even though it really wasn’t all that sharp. After much deliberation, I sent it back to Amazon to try another copy.

2) 2nd copy. This one was much sharper but back-focused, which I found to be even more annoying. This would manifest itself by someone’s eyes and nose being out of focus and their ears and hairline being razor sharp. After trying to force myself to live with it, I decided I couldn’t and sent it off to Tamron for calibration. Several people in lens forums mentioned that this did the trick, so I decided to give that a shot rather than send it back to Amazon (they were out of stock at the time anyway, so it made the decision easier).

3) Tamron told me that they were running slow, so it would take 5 weeks to calibrate it. Again weighing the extra $800 I’d have to pay to buy the Nikon, I decided to send it in. It actually took 8 weeks! And when I wrote them to inquire at the 7 week mark, they said they had no record of it. I think that was just because they had already shipped it, but it did scare me at first.

4) Calibrated lens. My first impression was wow, this thing really is sharp, and I was really glad that I has sent it back in. And that’s when I started noticing something strange… many of my shots were looking massively overexposed. I was out on a nice, evenly-lit overcast day, so I wasn’t able to figure out why the camera was having such a difficult time metering. After a few more shots, I realized that anything taken at an aperture smaller than f/2.8 would be overexposed, which led me to suspect a problem with the aperture blades. Sure enough, they were stuck wide open, so every picture was at f/2.8, regardless of the actual setting. At this point in the story, I was very unhappy.

5) Tamron customer service. I expressed my frustrations to them in an email over Christmas weekend, and I am happy to say that they responded positively the next business day. They gave me their Fedex #, so that I didn’t have to pay return shipping. They also promised that they would keep it for only 2 or 3 days and ship it back right away. That made me feel a little better.

6) ???? I have not received it back yet (should be soon), so I don’t have a final recommendation on this lens. My sense is that it will follow the “worth what you pay for it” adage. It will have taken a large investment of time (actually, waiting), but in the end I hope to have a pretty good lens at a relatively bargain price. There have been several times that I wanted to give up and just go buy the Nikon, but not being a professional, it’s really hard to justify paying $1200-1300 for a single lens.

Otherwise, the lens is really nice. It’s nice and compact for what it does, and what several have complained about as a “really loud focus noise” doesn’t seem bad to me at all. It does have some pretty serious distortion, especially at wide angle. It’s a complex moustache distortion which isn’t correctable with Photoshop’s built in correction. I did send in photos to the creator of PTLens, and he calibrated the lens and integrated it into the PTLens plugin (and standalone version). With that, your photos can be essentially distortion-free. It’s really impressive how well it works. Of course, I used the lens for weeks before I really noticed the distortion. I took a picture of brick wall and couldn’t believe how bad it was. Unless your photo has a continuous horizontal element, you’re unlikely to even notice this.

I wish my review could be more conclusive, but I’m feeling ambiguous at this point. Hope that this helps someone trying to decide on this lens.

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Tamron Af 17 50mm F 2 8 Xr Di Ii Ld Sp Zl Image

Tamron Af 17 50mm F 2 8 Xr Di Ii Ld Sp Zl Picture

Tamron Af 17 50mm F 2 8 Xr Di Ii Ld Sp Zl Picture

Tamron Af 17 50mm F 2 8 Xr Di Ii Ld Sp Zl Image

Tamron Af 17 50mm F 2 8 Xr Di Ii Ld Sp Zl Picture

Tamron Af 17 50mm F 2 8 Xr Di Ii Ld Sp Zl Pic