Auto focus works great. Not lightning fast
924693
Hard to beat for the price. No signs of wear. I'm not a professional by any means, so I can't offer a professional opinion on it. Auto focus works great. Not lightning fast, but not painfully slow. VR seems to be working fine. Zoom is phenomenal compared to my 18-55mm. This should be a blast for wildlife spotting from afar. I may even get a usable shot of the moon and upcoming eclipse.
1236597
This lens is great! This is my everyday lens for all types of purposes. The pictures come out crisp, but the autofocus is a little slow, especially in low-light conditions. Otherwise an awesome lens.
1374229
Great for the money and if you're working in video. May not be good for photographers or anyone that needs the auto functions. If you like to use a lens manually why pay for all that other stuff?
46786
Works well, but does not support fast shutter speeds for portrait photography. I was able to light subjects that can remain fairly still, but will only get about 1/8 sec at f5.6 in three light configuration. Does not substitute for strobe flash, but can be used for controlled portraits.
37106
After a few weeks of using I have taken great shots, but I have had to select central focus point or others focus points manually.  The nine focus points by default tend to select the near subject, and not is usually the subject that I wanted.  In SLR cameras the "deep of field" is more notorious, than point and shoot cameras.  Now I understand, why some people sees focus issues with this camera. Once you Understand the capabilities (and some limitations), You have a great photographic tool.

Another Thing, the first day I tried my old 420EX flash, It didn't work.  I tried Canon support for product compatibility questions and they respond very quickly.  Later I clean the contacts and the problems were solves.  I have tried this camera with my old EF 50mm 1.8II lens and EF 75-300 3.5-5.6 Ultrasonic with great results. (Sorry for my English)
4618295
Well worth the money spent.  The Auto focus works well with the Sony A100.
1777270
This lens has a very sharp picture and the auto-focus worked great at the Christmas show.  I was able to reach out a considerable distance with it.  I should have used a tripod though.  You have to know that when you are zooming that far, you will notice your movement of the lens more if you shake it when you take a picture.
4596604
Well, it's not an automated lens with AF and electronic aperture contacts.  But that's not why I purchased this lens.  This lens performs exceptionally well under low light conditions, and is very fast.  I purchased this for star photography work and you don't need AF, and almost always are not shooting in any of the automated creative zones like aperture-priority anyway.  This lens provides MUCH better image quality (better sharpness and less distortion, chromatic aberration and coma) than the equivalent Canon prime lens, period.  It also outperforms the best Canon glass during the day as well.  So, if you prefer image quality over automation, this is the lens for you, especially since it's a fraction of the cost of the Canon equivalent.
2577805
I'm pretty happy with the lens.  As described, it is not a zoom type lens so while framing a shot you have to do the zooming sort of speak.  Back up or go forward to frame your shot and let the autofocus do the rest.  I experimented with the manual focus as well.  Its a bit touchy in my opinion.  Here is a sample shot of my sister's variegated miniature rose.  The rose is in pretty good focus with the rest of field more or less blurred out.  I've also included a curious looking fly for whimsy.  It was quite patient with me, though I would probably have jumped out of my shoes if it had landed on me.  The rose was shot using manual focus, the fly was autofocus.
4432936
Works pretty good on my Sony alpha a6000 and Nex-6. Doesn't work on the Cannon 100mm Macro I have, but works very good on the 24-105. Focus takes a little longer than with a Sony lense, but it does work. With the macro lense it keeps hunting for focus. for the price though I'm happy with it.
51212
Since I generally use the auto settings on my camera, I really don't know what its capable of, but it certainly takes an extraordinary picture with this lens when the camera is making all the adjustments. This is my first time playing with Macro shots and its produced some great pictures, although nothing jaw dropping...that's probably more my eye for subject matter than the lens though.
370912
Good camera and the people pics do pop but slow auto focusing hinders it use for kids and moving events.  My Nikon D 90 auto focus better.
1352788
It's been a while since I've owned this, but it worked really well for me! No Auto focus, of course, but my sony A7s had focus assist and so I never needed it anyways! I never noticed any vignetting on either of my canon lenses, it always worked great!
1515220
Autofocus is very fast for normal uses. In the macro range, use manual focus for your own sake. Autofocus is reasonably fast, but  turn the ring yourself rather than have your camera hunting all over.  Bokeh varies with distance, but generally great.  This Tokina 100mm f/2.8 AF Macro is a great lens for macro, and especially good for use as a portrait lens. It is probably the best 100mm or 105mm macro there is, and costs less than other lenses. IMHO
2544486
Like that it's manual focus with built in hood. Seems sharp for the price. I just don't like the limited aperture stops.
93641
Of course they're not automatic.  Reminds me of taking pictures in the old days with my match needle 35mm. Kind of fun actually. Great lenses revived!
Even more things to do with my new Canon T3i.
4076030
Picture and microphone works great. But one thing I really hate is the auto focus. This thing refocuses every 5 seconds and it gets super annoying when you are chatting with someone. Even if you stay very still, the camera keeps auto focusing and will even auto focus when there's no object in the background moving. For the price, it delivers a great picture and sound quality, but the auto focus kills it.

You can turn off the auto focus feature, but you do not get crisp video every time.

I would only recommend it if you are the occasional video chatter and plan to annoy the other party tremendously.