Summary: DO NOT BUY THIS LENS OR ANY PRODUCT FROM THIS COMPANY I made the mistake of buying two lenses from Tamron. While the both lenses were good when they're working, it's the "Warranty" that's a sham. After owning the B005 (f/2.8 zoom that's made by Tamron) for 2 years, the Autofocus suddenly got stuck. We send it in for warranty service and within minutes of them receiving the item (according to delivery confirmation), they want to charge us $400 to repair the $550 lens.
Summary: I bought this lens over a year ago, and I just sent it into repair for the second time during this time. It stops auto focusing at the long telephoto range, and the other auto focus is very slow and many times it does not work. I have asked Tamron to replace the lens with a new one, and maybe the new one will not have this problem. Otherwise the lens is great, but it should not stop auto focusing this way. Either poor manufacturing quality, or a poor design.
Excerpt: I was shocked to find this more expensive lens was not of the same quality as Tamron's 70-300, i.e., people with thick fingers will find the zoom ring very difficult to use. At 270 the result is no where near sharp enough to warrant the price, and vignetting was terrible, so I returned the lens.
Summary: I purchased this lens six months ago and used it moderately. A month ago it stopped auto-focusing and I sent it back to Tamron for warranty repair. They informed me that it was damaged and would cost $400 (!) to repair. Upon questioning they dropped the price to $260. I want to be clear that this lens was never dropped or abused. Tamron tells me that the damage can occur if the lens is left on the camera (!).
Excerpt: I returned this lens shorthly after I tried it. I had another Tamron lens where I experienced lens creep. I returned the old lens under warranty at least 2, but I think 3 times and Tamron fixed it so I give them kudos for that. I read some other review which said that the 18-270 suffered from lens creep. In my case, it was more like lens slide.
Excerpt: I recieved the first lens and the focus ring would 'rachet' and catch. I sent it back and the second lens could not 'hold' once it focused, so things were blurry. I have two friends who have an older version of this lens and like it. Not for me. Spend your money on a different lens.
Excerpt: Bought it based on excellent reviews all over the net as "all-in-one" lens for Canon -T1i.<br />Compared with 18-55 kit lens - in 9 out of 10 pictures kit lens had visibly sharper focus. Against 55-250 - Tamron looks a little better on telephoto end, at normal end is clearly out of focus. Got better results with manual focus.<br />Returned it for refund -excellent service from B&H.
Pros: All around
Cons: Heavy bulky, No Increase In Performance, Pricey poor value
Excerpt: I use this with a canon D60 (18MPS) for wildlife photography. Its really disappointing and soft througout the entire range. Best things I can say is that it has a lens lock to avoid lens creep, is small and lightweight. But unless you are looking for home photos this is probably not the lens for you. Fortunately I had my back-up point and shoot Lumix which embarrasingly brought back the only usable pictures. For a [$] lens this is unacceptable.
Excerpt: Don't buy from this company they don't give everyone their deserved rebates some of us are just passed on from one rep to another until you get tired of contacting them. I had two rebates owed to me one for 50.00 and another for 30.00 years ago and am still waiting for them I called about six times over the first couple of years and just got one excuse after another. They admitted that I was due the rebates that everything was in order and still I got none to this day.
Pros: Durable, Easily Interchangeable
Cons: Blurry Focus, Heavy, Poor in Low Light, Slow Focus