It's not perfect but it's a very strong lens for the asking price
Mr Baz, Amazon
1 July 2015
Summary: I've personally owned and used this lens on 3 mounts, Pentax, Nikon and Sony. Currently using the lens on A mount (Sony) I've nothing but praise for this lens during extensive field use it's proven extremely capable and useful, and I've used it along other good quality lenses such as Sigma's and...
Excerpt: This was a replacement for the kit lens that came with my Nikon D500 and I have been very happy with it. Pictures come out exceptionally clear. It covers a useful range of focal lengths. The large diameter allows plenty of light in.
Pros: Consistent Output, Fast / accurate auto-focus, Good in low light, Strong Construction, Versatile
Excerpt: The Tamron 17-50 f/2.8 is a great lens. The build quality is good, fast autofocus, sharp and great color. The only things I could find that I didn't like was the focus ring turns during autofocus and the autofocus motor makes noise. Its not very loud but in a quiet environment it can be noticeable.
Pros: Durable, Easily Interchangeable, Fast / accurate auto-focus, Nice Bokeh, Strong Construction
Summary: Just Get it. You will not be disappointed. Its a great all around lens, super sharp, autofocus isn't the best, but it makes up for it with the 2.8 constant aperture. Very well built, solid piece of Glass.
Excerpt: After reading many reviews and going back and forth between this lens or Sigma 17-50, I finally pulled the trigger and order this one, I am extremely happy with this lens, great color and contrast, the key with this lens is to shoot it like a prime lens since there is no VR ( Vibration Reduction ) I...
Summary: On my new Pentax K5-IIs, this is very good do-it-all lens. Landscapes, portraits, street, interior (less so than wider angle lenses), except for birding, wildlife. I am thinking of getting one for my D7000 ti replace my workhorse but worn out 16-85mm.