Summary: Many others have written extensive evaluations of this lens and I generally agree with the conclusions they have reached. The point of my review is to state that the problems with the autofocus on this lens are not restricted to Canon cameras alone. I have a new Sony ILCA-77M2 (successor to the SLT-A77V) and this lens has severe problems both finding and maintaining focus.
Excerpt: Great lens with a great looking bokeh at f/2 and 2.8. Nice working distance of 100mm so you don't have the shadow of your lens in your shot. This is for APS-C cameras ONLY not full frame get the 90mm for full frames. Only con is the auto focus is a tad slow and jumpy but once it's focused it's spot on.
Pros: Durable, Nice Bokeh, Rugged, Strong Construction
Aaron J. Clark "Multi-Determined Dilettante", Amazon
4 June 2014
Summary: The difference in picture quality between this and my Nikon 28-200 is really dramatic. For both closeup macro and portraits I'm loving this lens. If you've never had a "fast" lens with a wide aperture and you want to make pictures that really pop, you really need something like this.
Tamron AF 60mm f/2.0 SP DI II LD IF 1:1 Macro Lens for Sony Digital SLR...
Sharon "Reddog", Amazon
12 April 2014
Summary: Very well made lens. Tamron really looked into all of the natural things that happen with light, reflection and focus. The focus was too soft for me with my dslr. Some people like soft focus. The company that sold this is KEH Camera company and the are top notch. They want you happy. They are very easy to work with.
Summary: I own this lens, although the quality of the glass is really good, the focusing is really bad. It's quite slow at focusing and slow at finishing focusing when focusing on something close up/macro. Works great as a portrait lens, as you might know. Cannot focus closer than an inch or two. I myself am thinking in investing in a better macro lens sometime.
Summary: I had tried this lens on my Canon 7D many times (not as a macro lens, but for portraits) and was not happy with the results just by looking at the camera's lcd, so i always ended up using my ef-s 15-85 which is amazingly sharp and reliable (you may read its review in the-digital-picture.com). one week ago i received the focus pyramid tool (http://www.amazon.com/gp/product/B007QUG3XA/ref=oh_details_o00_s00_i00?ie=UTF8&psc=1) and decided to calibrate my lenses.
Summary: I have used this thing to photograph snowflakes at night, moss on rocks, and my dog's nose. This lens gives great performance and the aspherical effect is kinda trippy when things are out of focus ( but in a good way ). My only complaint is that the auto focus is a bit noisy. I have this problem with most of my tamron lenses. I got this used, and so, the functionality / price ration is still pretty high for me.