Summary: The only downside is that it doesn't have auto focus and there are no guides to help focus like there used to be in the old 35mm SLR lenses so you have to just "see" if the scene is in focus. Of course, if it did have autofocus, it would be much more expensive. Upside is the price. I don't think you could get this level of zoom any cheaper - I paid about $40. The quality of the picture is fine. The difference to me comes down to price vs. autofocus.
Decent lens, but there's 2 versions it looks like.
4 December 2013
Summary: The lens offered appears to have changed alittle. When I bought it back on 3/13 there was no autofocus motor in the lens and was listed as model number A15. Now a new picture appears clearly showing an autofocus motor and the model listed as (A15N). Amazon should probably update the listing description as it still leads the customer to believe there is no autofocus motor. All in all it's a decent cheap lens that will give you alittle more reach than the basic kit lens.
Summary: Excellent image quality, easy to use. Price is so low from KEH you will be immune from buyer's remorse. With Nikon mount, this lens requires camera with focus motor screw drive in mount for auto focus. Manual focus works on all cameras.
Good product for the price especially for somone starting out on a budget
14 January 2013
Summary: Contrary to what several others reviewed, this is an autofocus lens if you've go the camera that will do it. Running on a Nikon D800, it works fine, a little noisy, but you get what you pay for. On my 3100 its strictly a manual focus lens. Few test shots I've done so far seem fine, but won't know more until I can really get out and use it this weekend.
Summary: good build for themoney and will be used as a quick back up for my Nikon. As was stated in the ad the auto is not compatible with the d5000 but tried it on my brothers d300 and its auto focus was dead on.
Summary: I bought this on sale here for 40 smackers. The quality and feel of the lens is ok, it takes great shots tho. Some complain about the focus noise, its true it is loud and if you don't have a body with a focus motor then you don't have to worry about it :). I have recommended this to others who want a cheap lens that works well and they seem satisfied with it.
Great Bargain, but there are a couple of minor caveats
3 November 2012
Summary: I just bought one of these recently and have been testing it like mad. It seems sharp as a tack, and nice and light. An incredible bargain at $40! Only one fly in the ointment, though: When using this lens, my D200 underexposes by about a full stop. Knowing that (from my testing), I can live with it. I just need to set the camera to +1.0 stops on the exposure compensation when using this lens. Easy enough to do IF I remember.