One of My Best Lenses
589319
If you have done any research on this lens then you already know how great this lens is. I use this lens for everything from weddings to portraits to events. It's very versatile and the quality of the results are just amazing.
1167387
I love this lens! Every since I've purchased it it's been the main lens I use. I love taking portraits and close ups and the clarity is astounding. I've even made some light portraits with it at night and they turned out amazing. I absolutely love this lens.
1768301
I bought this lens for portraits and general walk-around photography. It complements my 24-70mm f/2.8L and 135mm f/2L very nicely.

On a crop sensor camera (Rebel series, 40D, 50D, etc.) you will get a full frame field of view equivalent of 136mm, which may be a little long for some pictures. I have a 450D (Rebel XSi), and it works very well on it.

Pros:
- Lightning fast auto focus
- Excellent sharpness, even at f/1.8. It's performance is similar to my 135mm f/2L, which is says a lot.
- The price. You're getting a "sleeper L lens" without spending a fortune. The L version of this lens is roughly $2000. You're getting a lot of bang for the buck.
- Excellent bokeh. Backgrounds are very smooth.
- Well built. It feels solid when I hold it, unlike the plastic kit lens.
- Small size and lightweight. It's very inconspicuous and doesn't stand out.

Cons:
- There's some visible CA when wide open at f/1.8, but not really a problem for most situations. Stopping down to f/2 or f/2.5 will generally fix it.

Considerations when buying this lens:
- This lens has a 3 foot minimum focusing distance. You can't get too close to your subjects.
- The full frame equivalent FOV (136mm) may be too long for those on a crop sensor camera, depending on what pictures you're taking

Overall, I love this lens. I've been very happy with its performance, and the pictures that I get are simply incredible. If you're interested in a good portrait/short telephoto lens, this is the one to get.
2234785
This lens is fantastic.  It's really sharp and the color is really good.  It's really good for portraits.  I wish I had gotten this lens a long time ago.
1889401
I bought this lens new on a whim as the price was too good to pass up.  I now use this lens in most of my photography, automobile racing, nature and some landscape.  A favorite next to my 28-135mm Canon.  I really like the quality of Sigma lenses for my Canon 20Ds.
41235
Hi, I have to add my 2 cents to the existing reviews because of how much I love this lens. Under every aspect, this is a state of the art lens. Mounted on my EM5II, it makes for an elating shooting experience and gives me plenty of IQ for fine art, poster size prints. Size, weight, sense of solid construction and smoothness of zoom and focus rings are some of the best on the market. AF is VERY fast. Quite a large % of my photography falls within its focal length range which means that it rarely comes off the camera. Its close-up capabilities are also quite useful (at 80mm, it fills the long side of the frame with a 2 1/8" subject). This combination of body and lens makes me look for any reasonable excuse to pick it up and take pictures.
4021954
what an amazing lens. a little heavy, brings the quality of the A850 to its ultimate, I love it and i am sure it won't leave  my camera very often. both zoom and focus ring give the right amount of resistance. Most importantly, it brings with it amazing picture qualities. I now feel like a pro when showing of my pictures.
393884
I'm an amateur photographer, so sorry if my technical specs are just babble to you. But this is such a great lens. The only downside is it's manual focus, but that's what you get with an older lens. It has SUCH an amazing DOF. It's perfect for portraits and creates bokeh.

well worth the money!
14307
I love this lens. I've had a 60mm micro since the early 70's, but just purchased the Nikon 105mm macro from Amazon because I needed to get close from further away. My older 105 portrait lenses are magnificent, so when I knew I needed to go macro at 105, I didn't hesitate. Priced right too.
If you don't mind getting close to your subject the 60mm lens is legendary.
1474273
This lens is one of the best deals in mirrorless photography! I own the 25mm, 45mm and 75mm olympus lenses as well as the 14mm panasonic and after a few months I can say the 25mm is my go to lens. Even with the other lenses I own I find I use the 25mm a lot for doing portraits as it is so sharp wide open it's not funny! This lens also handles flaring so well that I have almost found it impossible to make it flare! It is an all around lens that though it's not as wide as say the 17mm, it is so useful for everyday photography and again, I can't say enough about how sharp it is on my EM1. Recommended 100%
4737833
I have had this lens for about 5 months now and am delighted by its field performance. The body is plastic, but all elements fit together very well and the lens feels very solid. There is no way to mount a filter on the front of a fisheye, so this is a lens you have to treat with kid gloves anyway. There is provision for adding a filter on the camera side of the lens if you are ambitious enough to play with that.
I am using this lens with a Nikon D-700.
There are limited uses for a fisheye, but when you hit the right shot for it, this one works great. Chromatic aberration is very low and lower than I have seen in other lenses like this one. The autofocus works well, but with a fisheye, focus is rarely an issue anyway. With the f2.8 speed and ultra wide angle I usually have this lens stopped down and then the DOF is something like 18" to infinity.
I had originally made it my policy to stick to OEM lenses since I had bad experience with after-market models. I will add Sigma to my hunt for any lens purchases in the future. This lens is fully as good as the OEM, and in this lens model may exceed the OEM lens. This lens is a newer design than the aging Nikon model.
I highly recommend this lens.
1393661
I absolutely love this lens, it has become my go to lens for many of my shoots. Macro is awesome as well as long shots.
2931815
I have been using this lens for about a month now. It is a really good lens and provides me with enough quality to get great shots in low light situations. It is fast, highly durable, I just wish it was a little longer.
2048095
This lens hardly ever leaves my camera. Since I purchased it, it's given me really nice images. I love the bokeh it produces and it's really sharp (I usually shoot at 2.2f-2.8f).
1845624
I have had this lens for years but over time of frequent travels it got damaged.
I didn't hesitate to buy it again
518623
This lens has been a great. I highly suggest it for beginning photographers. I had borrowed my friends EF 70-300 and I loved the zoom on my new camera. the only problem was my hands would sometimes shake because I would be hiking and tired. So I found this lens and have loved it since day one.
the image stabilizer is a must for me. it helps so much to not have to worry about quality of the shot when the lighting is not good enough to take a high speed shot. It also makes my camera more complete with the 18-55 and the 55-250. Great color quality and focus.
1306292
I use this for portraits and macro work. Creamy bokeh and razor edge sharpness make this lens a favorite. Good build quality and the push-pull focus clutch is an excellent feature.

I also have a Nikon 18-200mm which I often use, but when the situation is appropriate, I prefer this one for its amazing sharpness and excellent bokeh.