Excellent lens. I have the Black Iridium in all ...
935958
Excellent lens.  I have the Black Iridium in all of my other Oakley products and this one is just the same, great!
4148044
This is an amazing lens. I bought it, along with a Nikon D40X. Yes, it is big and heavy, and zooms to the 35mm film camera equivalent of a 450 mm lens. What makes it so superior to the less expensive, non-Vibration Reduction lens is how well it maintains the shot while focusing. I take a lot of pictures of birds, and can hold my camera with this lens on the subject, press the shutter down half-way, and see how it locks onto what I'm shooting. I hear the motor working inside the lens, and can just continue on focusing until I get the shot I want. If I look through the lens without auto focus, I can see just how shaky I am in holding the camera. The vibration reduction is just amazing. This lens produces clear close up pictures. I recommend it highly.
4856978
I'm thrilled with my new Zeiss Nouit 32mm on my Fuji x-e1. I just have a thing for the Zeiss "look" and the 32mm nouit does not disappoint. It's extremely sharp with that special contrast and color. The AF is generally good (relative to the x-e1, firmware update 2.10) and the build is very solid, the focus ring especially feels impressive. Great lens, highly recommended.
568920
Excellent lens.  This lens is extremely sharp even when it is wide open, though it is little noisy.  I am using it with XE1. The color rendition is great.  The lens produces beautiful bokeh.
4766864
Good lens, sharp on a Canon 50D.  When new, the manual focus ring was tight, after two months, it has noticably loosened.  Compared to the kit lens, 28-105 IS, the improvement in image quality is extremely clear.  Kit lens is now gathering dust.  For landscape, the 35mm is quite good, sharp, and I have no problems with contrast or colors.  For product photography, this lens shines.  F8 to F16 produces fabulous results.  Soft wide open, but what lens isn't.  At F18 and above, defraction occurs, I don't shoot at F20 or above for the most part.  I took this lens to a horse show and was amazed at the clarity, from approx. 40 feet away, you can see the individual hairs on the horse.  I was impressed.  If the manual focus ring wasn't loosening up a bit, I would give this lens a five star across the board.  Will is stand up over time?  I'll budget to replace it when it breaks is all I can say.  Recommended for advanced shooters, semi pro and a pro can use it without hesitation if he or she doesn't want to pop the funds for L glass.  Everyday photographers who don't need the sharpness nor clarity of colors probably won't need this lens. For the advanced shooter, handheld at ISO 100 with shutter speed at above 100 is fine, I like to keep it at 160 and above for money shots.  Autofocus is usually dead on, I haven't seen a problem with focus issues.  Good glass, hope it lasts.
3373951
Excellent quality lens. Have used for approx. 150 shots thus far with no problems/complaints. Pictures have been clear and crisp. This lens is an excellent addition to the kit lens provided with the purchase of Pentax K10D and Pentax K100D. Purchased this lens for a great price through Amazon.com.
2691435
I've been using this lens for two months now and I would buy it again. It fills a need for a quality all-purpose lens at a reasonable price. As I learn more about my camera and photography, I'm taking better pictures. The problem isn't always the lens; sometimes it's me! All I can say is this lens works for me. And if 135mm isn't close enough for general shooting, walk closer. I also purchased the Canon EF 50mm f/1.8 and EF 28mm f/1.8. Those lenses are fantastic for low light, indoor pictures, group shots, portraits. To repeat, I would purchase this lens again. No regrets whatsoever.

I've used this lens with a tripod to take some excellent nature shots in all types of light. I've used it indoors to photograph events at nursing homes and churches without using a flash. I plan to take it with me to Scotland this autumn and make it my "go to" lens. I will also take along my 50mm, since I like taking close up shots in cathedrals, etc., and that's always really low light. Finally, if you just want a great point-and-shoot, fire away type lens, this is the one to get. You can't go wrong. It's very versatile and it puts out high quality pictures, in my estimation.
4722376
Superb lens with excellent rendering. Extremely sharp centers, decent corners, though watch for field curvature. Works very nicely on A7R II - tiny bit of blue in the corners, but nothing unusable.
3002096
A true pleasure to use this excellent lens.  This is my second macro lens.  The first is also a Sigma product.  I find this lens easy to use and capable of producing excellent macro photographs.  IQ is superb.  Operation is smooth and easy.  I also appreciate that it can well be used as a medium range telephoto lens, in addition to its macro abilities.  I definitely WOULD recommend this lens to a friend.

Thank you Sigma!
3365489
I would recommend this lens to anyone.
I ordered this lens and received it just today, Saturday, November 10, 2012. I use it on a Nikon D-5100. I have not experienced any of the problems that I read in some of the reviews. It pays off in spades to read fully, all of the operating instruction BEFORE installing it to your camera.
After a few test photos, I love this lens, and am surprised at how fast it does focus. I have shot both OS off, on 1 and on 2, and find it easy to use. Not too much problem using it hand held. Using it with the cameras AUTO setting ensures great exposure, but using it on manual setting works well, if you are experienced in determining available light and have not problen setting speed and apperture.
I have also read some reviews where some have had difficulty using the manual focus with the tripod collar on the lens. I tried it, and no problem at all. Focus ring is firm to the touch, but easily move with just a finger touch. I have not experienced any proble. I have taken some bird shots, that previously, I would have to some major cropping to do, being unable to get close enough to to acheive a great photo. Easy to crop photos for a decent finiched product.
As opportunity presents itself to go afield, and really get to use this lens, I will post some to show how well it works.
The first three days it has been cloudy with some rain, but today, day four, it is clear and sunny.
<a data-hook="product-link-linked" class="a-link-normal" href="/Sigma-150-500mm-f-5-6-3-AF-APO-DG-OS-HSM-Telephoto-Zoom-Lens-for-Nikon-Digital-SLR-Cameras/dp/B001542X64/ref=cm_cr_arp_d_rvw_txt?ie=UTF8">Sigma 150-500mm f/5-6.3 AF APO DG OS HSM Telephoto Zoom Lens for Nikon Digital SLR Cameras</a>
4875350
I've only had this lens a day, i hope to return and add to this review as I use the lens.

I struggled for some time trying to decide between this and the f/4L 70-200. since i already own a 55-250 i decided to wait a while to upgrade (I've gotten nice shots out of the 55-250, and i don't use it very often, no need to the 70-200 yet)

back to this lens, i chose it because everyone said it rivaled L glass. while i do not own an L lens yet, i can say that my initial results with this lens blow any of my other lenses out of the water. it will probably become my favorite lens soon. (right now my most used lens is the 50mm 1.4)

focusing in a macro set up has been slow as others have stated (and inaccurate). but i've found i prefer live view with manual focus for macro. the focus ring is well built and feels smooth. its very easy to find perfect focus on manual. and honestly, who auto-focuses in macro anyway?

using it as a normal 100mm prim I have found focusing to be fast and accurate. especially when i restrict the focus range. the lack of IS hasn't been an issue. though admittedly i've used a flash with it up to this point. (it arrived at night)

Bokeh is terrific. smooth and creamy. it rivals if not surpasses my 50mm 1.4 lens but i'll be testing this out tonight.

construction of the lens is solid as others have said. its my heaviest lens by far. the front element sticks out a bit, i strongly suggest a filter and lens hood. you may want the tripod ring as well but i don't think its required. as i stated before, the focus ring feels good in my hands. turns smooth, and the ability to overide autofocus is well recieved here, i wish all my lenses could do this.

very  impressed with this lens, and my decision. the image quality is absolutly outstanding. I might skip the 70-200 in favor of the 200mm 2.8L prime in the future. (im falling in love with primes :-p )
947504
This is an awesome lens. I purchased it for the shallow depth of field as my number one priority and the low light capability for the second priority. The extra 2 stops over my GP lens needs some getting used to in daylight photography. A sharp lens wide open, the focus needed a small tweek on my D600. The lens hood is rather large and somewhat impends handling (mounting-unmounting) while in the field.
4288392
I have own this lens now for over 4 weeks and I am amazed at the built quality if the lens. Far superior than all my other lenses that are mostly built out of plastic. Some people say that this lens is soft but in reality if you have a tuned lens with your camera the results are outstanding. I find that wide open at 2.8 and 28mm produces among the sharpest pictures I have ever taken. On a cheaper 3rd party lens I would had stopped down to f/4 to get the same results in terms of sharpness. What all this means? You get great blurred out background(bokeh) and low light shooting capabilities. Also the aperture blades are well rounded so you get those beautiful rounded circles in the bokeh and not the octogons found in cheaper lenses. On the sour note, this lens has been nicknamed the beast for a reason and that is the size and weight of the lens. Not to mention that when you add the hood then heads start turning. Thats one reason I bought a rubber hood for the lens. At least it kind of blends in with the lens so not that many stairs come my way. If you can find one in great condition, get it! It works for DX and FX bodies(unlike the nikon 17-55mm 2.8)and you will also be future proof. I have worked in this 28-70mm range for awhile and I like the range even on a DX. I used own the tamron 28-75mm2.8 which is not as sharp. Great for portraits!

update... its been 2 years and 4 months to date since I got the lens. The only dilemma I had with the lens is that is not sharp at the long end at 70mm 2.8 (wide open). Its been frustrating because at the long end wide open is the appropriate range for portraits and aperture. I thought it was this lens only but after extensive research online- I saw other reviews which pointed the newer nikon 24-70mm2.8 suffering from it and also the older 2 ring nikon 80-200mm 2.8 racked out wide open. Don't know if its a nikon thing but it sucks. Have to use my trusty 85mm 1.4d to shoot outdoors. Nevertheless, why upgrade if the other lenses also have the same problem. I just keep using it- I just have to remember to stopped it down to f/3.2 when doing 70mm.
2354812
Great lens!  Very sharp, fast focus.  Just have to get used to the zoom ring going in the opposite direction from all the other Nikon mount lenses I own!  It does have the known firmware conflict issue with my D7100 that you can research on the web that effects reviewing images or using Live View using your back screen on your camera.  Details can be found here: [...] Doesn't get in the way of anything I need the lens for!
141372
I have many favorite lenses, but overall, the 70-200 f/2.8 II is now my most-favorite - a status the predecessor to this lens, the Canon EF 70-200mm f/2.8 L IS USM Lens (version 1) held prior to this review. I was happy with the original 70-200 f/2.8 L IS, but a new version of a lens usually brings improvements of significance, as this has and at a higher price tag. The Canon EF 70-200mm f/2.8 L IS II USM Lens' real world image quality and image quality improvement over the original version are impressive!!!. The 70-200 f/2.8 IS II is very sharp wide open from the center of the image circle right into full frame corners at all focal lengths. Contrast is especially impressive a noticeable improvement over the version 1 lens. Stopping down increases sharpness only very slightly. I've used the lens on my Canon 1Ds, 1D Mark IV, 7D, and 5D Mark II. This lens is so sharp, that I have to set my 7D sharpness back down. It's unbelievable!!! It is not an inexpensive lens, but it is very worth the price in my opinion, and very worthy of its "L Red Ring" This is a completely pro level lens, you definitely do not have to be a pro to appreciate it at any level you are at.

ScottG
3727213
Great lens. The glass is a great improvement to the kit lens I've been limping along with. The range of the iris has make my work 5 times easier and higher quality.
774889
This is a fantastic lens for the price. The build quality is very very good.  This is my favorite lens to use.