Sigma 18-50mm f/2.8-4.5 DC OS HSM Standard Zoom Lens for Canon EOS Digital SLR Cameras - US Warranty

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About Sigma 18-50mm

Large Aperture, Standard Zoom with Optical Stabilization...

An upgrade to its predecessor, the 18-50mm F2.8-4.5 DC OS 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.

The Sigma 18-50mm is commonly used for Landscape/scenery, Low light, Macro photography, Night photography, Sports/action, Video, Weddings, Wildlife photos and more.The Sigma 18-50mm is most used by customers who consider themselves to be a Casual photographer, Photo enthusiast, Semi-pro photographer among others.The Sigma 18-50mm is popular because customers like the following qualities of the Sigma 18-50mm: Consistent output, Durable, Easily interchangeable, Fast / accurate auto-focus, Lightweight, Nice bokeh, Rugged and Strong construction

Summary of Customer Reviews

Customers most agreed on the following attributes:
Fast / accurate auto-focus (33),Consistent output (32),Easily interchangeable (31),Lightweight (29),Durable (27),Strong construction (25),Rugged (14),Nice bokeh (9)
Poor in low light (3),Slow focus (3),Heavy (3)
Best Uses:
Landscape/scenery (28),Weddings (23),Low light (22),Sports/action (12),Macro photography (11),Night photography (11),Video (8),Wildlife photos (8)
Reviewer Profile:
Photo enthusiast (22),Semi-pro photographer (13),Casual photographer (5),Pro photographer (4)

Sigma 18-50mm Features

  • Optical Stabilizer: Sigma's own OS System
  • Large Aperture/Wide Angle: Superior low light photos
  • High Image Quality: Two SLD glass elements and three Aspherical lenses corrects all aberrations
  • Includes: Petal-Type Hood
  • Mounts: Sigma, Nikon, Canon, Sony and Pentax

Sigma 18-50mm Specifications

16 Elements in 12 Groups
Angle of view
69.3 - 27.9 degrees
F stop range
Closest Focusing Distance
30 cm / 11.8 inches
Maximum Magnification
Filter Size
Dimensions (Length x Diameter)
Diameter 74mm X Length 88.6mm
395g / 13.9 oz
Number of Diaphragm Blades: 7 Pcs.
* Vignetting will occur if the lens is used with digital cameras with image sensors larger than APS-C size or 35mm SLR cameras.
* For Pentax mount, if the camera body does not support HSM, auto focus will not be available.

Sigma 18-50mm Reviews

Review Snapshot®


(based on 48 reviews)


of respondents would recommend this to a friend.

Ratings Distribution

  • 5 Stars



  • 4 Stars



  • 3 Stars



  • 2 Stars



  • 1 Stars



Most Liked Positive Review


Nice Lens, Good quality

I debated on this lens and one that has a constant 2.8 w/o OS. The OS helps in low light situations so having a f4.5 is not really a problem. What 2 things I really like about the lens are the HSM and fully internal zooming. The lens does not extend for zooming or focus, a feature I have with other lenses.


Most Liked Negative Review


Good for the casual user

I bought this for the IS to help in low light situations during wedding photography. The IS seems to work pretty good, but the images are softer than I expected. It's obviously not a Canon L lens, but I did expect better. The biggest issue is slow focus in anything but ideal conditions. Not a good quality for even a semi-professional wedding photographer. In all this is a good lens for a casual user and maybe worth the price if you are only buying it to upgrade from a kit lens. As for me, I w...

View full Review

I bought this for the IS to help in low light situations during wedding photography. The IS seems to work pretty good, but the images are softer than I expected. It's obviously not a Canon L lens, but I did expect better. The biggest issue is slow focus in anything but ideal conditions. Not a good quality for even a semi-professional wedding photographer. In all this is a good lens for a casual user and maybe worth the price if you are only buying it to upgrade from a kit lens. As for me, I wish I had purchased the 18-50mm f/2.8 instead even though it's a bit more. I also bought Sigma's just released 50-200mm IS for wedding photography and, though I haven't used it yet, I'm afraid it may be about the same in quailty.

Reviewed by 48 customers


Happy with my purchase.


from Butler, PA  -  Photo Enthusiast

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.


Somethings you should know


from tracy,ca  -  Photo Enthusiast

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.


Good for the price


from Denton, TX  -  Photo Enthusiast

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.

(0 of 1 customers found this review helpful)


Unbelievable value!


from Sumerville, SC  -  Semi-pro Photographer

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, 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!

(1 of 1 customers found this review helpful)




from Nacogdoches, Tx.  -  Photo Enthusiast

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 lens.


from Williamsburg, VA  -  Photo Enthusiast

Great for indoor photography in low light situations.


Great lens for a the price


from Dublin, OH  -  Casual Photographer

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.


Sweet baby!


from Cincinnati area  -  Photo Enthusiast

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 Lens


from Santa Clarita, CA  -  Photo Enthusiast

Great addition to my lens collection...


A+ Kit lens upgrade


from Sylmar,Ca  -  Photo Enthusiast

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


Questions & Answers Powered by TurnTo®

Questions about this item:

Shopper  Why Did You Choose This?
RICK T  Great price for a great lens. Very happy with the performance of this lens.
Dirk S  how wide is the angle at 18 mm ?
CURT K  I do not exactly how wide it is, but I do feel that it is wider than my Canon 18-55IS. It is alot shaper as well. It is a little soft on the corners at 2.8. I wish I would have bought this lens 2 years ago when I first got into the SLR cameras. I would recommend this lens to anyone looking to upgrade from your "kit" lens
Douglas E  will this work with my canon eos t2i ?
JAMES C  I have a canon it should be fine

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