Large Aperture, Standard Zoom with Optical Stabilization...
An upgrade to its predecessor, the 18-50mm F2.8-4.5 DC HSM is a lens dedicated to digital SLR cameras with APS-C size image sensors offering a large aperture and Sigma's Optical Stabilization.
Once again, Sigma has also engineered the built-in OS function, an anti-shake system, (for Sony and Pentax mount) allowing the photographer to see a stabilized image in the viewfinder. The combination of the large aperture of F2.8 and anti-shake function makes capturing exceptional photos in low light achievable, and the wide angle is wellsuited for indoor photography.
Two SLD (Special Low Dispersion) glass elements and three Aspherical lenses provide excellent correction for all types of aberrations. The Super Multi-LayerCoating reduces flare and ghosting. Designed with inner focusing and inner zooming systems, high image quality is assured throughout the entire zoom range.
The overall length of the lens does not change during focusing and zooming ensuring convenient handling. This lens has a minimum focusing distance of 11.8 inches (30cm) throughout the entire zoom range and a maximum magnification ratioof 1:4.1. The incorporation of HSM (Hyper Sonic Motor) ensures a quiet and high speed auto focus.
* There is no built-in OS function in Pentax and Sony mount lenses.
The Sigma 18-50mm is most used by customers who consider themselves to be a Photo enthusiast among others.
Most Liked Positive Review
Great addition to my lens collection...
Most Liked Negative Review
Good kit lens
This lens was bought to replace an old 28-80 f3.5-5.6 Minolta kit lens. Overall, it is a decent replacement. The build quality is much better, focusing is nice and quiet, and it is wider at the wide end (although not as long at the long end). With that said, the image quality is about the same, with the images being a bit soft. Image stabilization is also unnecessary on Sony cameras, and the image visibly droops when the stabilizer goes to sleep (and recenters itself as soon as you half-press...View full Review
This lens was bought to replace an old 28-80 f3.5-5.6 Minolta kit lens. Overall, it is a decent replacement. The build quality is much better, focusing is nice and quiet, and it is wider at the wide end (although not as long at the long end). With that said, the image quality is about the same, with the images being a bit soft. Image stabilization is also unnecessary on Sony cameras, and the image visibly droops when the stabilizer goes to sleep (and recenters itself as soon as you half-press the shutter). Conclusion: if you are looking for a kit lens, this is better than most other lenses out there. For about the same price, you get internal focusing and zoom (so the lens doesn't change in size), a slightly wider aperture, and better build quality. Since image quality is about the same, this lens is a good choice on a tight budget.
Reviewed by 48 customers
I have a 50mm 1.4 ons and used it as my close focus lens or carry around lens. On a trip to NC I found myself in some situations where because of the crop factor I couldn't get in everything I wanted and needed more of a wide angle. Checking with friends the Sigma 18mm-50mm seemed to be a great fit. I have been very pleased so far but the weather has restricted it's use somewhat so far. To be sure I have used this lens ( a new lens has to be used immediately as everyone knows) and am very pleased with the results. The lens is small and light and I see it as my universal lens along with my 70mm-200mm I now cover the entire field. I was a little concerned because this is my first non Nikon lens but after see and using this lens I feel much happier with it,s purchase.
Overall construction of lens with internal moving parts is very good. But there are two things that you should know, If using the on board flash, when the lens is open up to it's widest setting w/ hood, there is a very large shadow blocked area, second and something the surprised me, is that after you take your picture, the picture revue stays on. Requires that you press the revue button to turn off screen. no big problem , but it is a surprise. other then those two things this is a very good lens for the low price.
As an advanced amateur on a budget, this lens does nicely. It is acceptably sharp for the price, but obviously does not perform to the level of pricier models. The stabilization feature is a real plus.
I wanted to upgrade the 18-55mm kit lens that I use on my Nikon D90. I first bought the Tamron AF 17-50mm F/2.8 SP XR Di II VC from another vendor. I was extremely disappointed. The sharpness was very poor, the lens was heavy and to be honest...the Nikon 18-55 kit lens performed better. I returned it. I was about ready to stay with the Nikon kit lens when I came across this Sigma lens. Adorama had a used copy so I decided to give it a go. I can't tell you how impressed I am with it! It is EXTREMELY sharp. The AF is lighter and much quieter than the Tamron, and very fast. I have only taken about 100 shots with it, but I LOVE THIS LENS. Landscape shots, close-up, daylight, shadows....it performs wonderfully. And, it is half the price of the Tamron. Not to be sacrilegious here since I am a Nikon owner, but I do believe the OS is better than Nikon's. I took an indoor shot with a shutter speed of 100 and it turned out very sharp. I'm quite sure this will be my go-to lens for a long time. Thanks Sigma!
This Sigma is my Kit Lens replacement and WOW what a difference! Great lens, Great price, Great delivery. Could not be happier. This is my second Sigma and I love them both.
Great for indoor photography in low light situations.
I bought this lens to replace my Canon EF-S 18-55 IS. Now I constantly use this lens along with my nifty fifty. I am impressed with the HSM and the wide apertures. I was a little concerned about the some of the reviews that spoke about chromatic abberations, but I did not see anything as such so far. The focussing is not outstanding at low light, but you cannot expect that from a lens in this price range. I would definitely recommend it to others.
My kit lens broke, so I researched a solid, useable inexpensive replacement . This lens popped up and I took the plunge. I love the internal zoom and focus function. It feels strong, but maybe a bit heavy. I've not had a bad experience so far and used it in many different situations. My other lens is my "walk around" and it's the Tamron 18-270 and I love it, but this fill a very nice niche.
Great addition to my lens collection...
This is definitely worth the money and such an upgrade to the kit lens. WAY SHARPER than the kit, nice heavy build. Doesnt leave my K-5