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Sigma 17-50mm F2.8 EX DC HSM

Sharpness 
 9.4
Aberrations 
 8.8
Bokeh 
 8.6
Autofocus 
 8.8
Handling 
 8.8
Value 
 9.2
Reviews Views Date of last review
45 173,074 Mon December 23, 2019
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Recommended By Average Price Average User Rating
98% of reviewers $432.02 9.11
Sigma 17-50mm F2.8 EX DC HSM

Sigma 17-50mm F2.8 EX DC HSM
supersize
Sigma 17-50mm F2.8 EX DC HSM
supersize

Description:

This compact and fast (F2.8) zoom is designed for APS-C size sensors. The lens†is equipped with Sigma's Hyper-Sonic Motor (HSM) which provides for fast and quiet autofocusing. The lens has no provision for screw-drive autofocus. The lens focuses down to 11" (28cm).


This lens is identical to the†earlier Sigma 17-50mm F2.8 EX DC OS HSM except for the removal of in-lens optical stabilization.


Sigma 17-50mm F2.8 EX DC HSM
© www.pentaxforums.com, sharable with attribution
Image Format
APS-C
Lens Mount
Pentax K
Aperture Ring
No
Diaphragm
Automatic, 7 blades
Optics
17 elements, 13 groups
Mount Variant
KAF3
Check camera compatibility
Max. Aperture
F2.8
Min. Aperture
F22
Focusing
AF (in-lens motor)
HSM
Quick-shift
No
Min. Focus
28 cm
Max. Magnification
0.2x
Filter Size
77 mm
Internal Focus
No
Field of View (Diag. / Horiz.)

APS-C: 82.6-33.2 ° / 72.4-27.9 °
Hood
Included
Case
Included
Lens Cap
Included
Coating
Multi-coated
Weather Sealing
No
Other Features
AF/MF Switch
Diam x Length
84x91 mm (3.3x3.6 in.)
Weight
565 g (19.9 oz.)
Production Years
2011 to present (in production)
Pricing
$339 USD current price
$564 USD at launch
Reviews
User reviews
In-depth review

Buy Lens: Buy the Sigma 17-50mm F2.8 EX DC HSM
In-Depth Review: Read our Sigma 17-50mm F2.8 EX DC HSM in-depth review!
Price: $594
Mount Type: Pentax KAF3 (in-lens AF only)
Price History:



Add Review of Sigma 17-50mm F2.8 EX DC HSM Buy the Sigma 17-50mm F2.8 EX DC HSM
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Sort Reviews by: Date | Author | Rating | Recommendation | Likes (Descending) Showing Reviews 1-15 of 45
Veteran Member

Registered: September, 2018
Location: Poland
Posts: 453
Lens Review Date: December 23, 2019 I can recommend this lens: Yes | Price: $250.00 | Rating: 8 

 
Pros: build quality, IQ
Cons: big filter thread, inconsistent AF
Sharpness: 9    Aberrations: 9    Bokeh: 9    Autofocus: 8    Handling: 8    Value: 8    New or Used: Used    Camera Used: K-50   

It's a good walk-around zoom and wide aperture is a big advantage. Seemingly there are disparate opinions on IQ wide open but my copy is decently sharp wide open on all focal lengths. It's a bit heavy but I wouldn't consider it as a flaw since it is fast (2.8) - so it's kind of natural. Now, the AF: my copy needed minor in-body correction, so that's not a problem. But it happens that AF, although pretty fast, hunts a lot even in a good light. In similar conditions, my kit zoom works perfectly (when it comes to AF) so something is wrong here with the sigma. On the other hand, the overall usefulness is very high and like this lens a lot despite AF being inconsistent at times.

F/2.8
   
Site Supporter

Registered: October, 2016
Posts: 156

2 users found this helpful
Lens Review Date: October 6, 2019 I can recommend this lens: Yes | Price: $230.00 | Rating: 9 

 
Pros: Sharp, quiet, Good AF, F2.8
Cons: Heavy
Sharpness: 10    Aberrations: 10    Bokeh: 9    Autofocus: 9    Handling: 8    Value: 10    New or Used: Used    Camera Used: K-3   

This is my go to lens for wide shots and portraits where I have limited space.

Sharpness - This lens is a bit soft wide open but sharpens up very nicely by F3.5. I gave the lens a 10 but in reality it is more of a 9.5

Colors - I find the colors natural and balanced. I rarely have to mess with the saturation.

AF- The HSM motor is quiet and quick. It is not my fastest focusing lens but since most of my shots are stationary it is fine.

Handling - As others have indicated the lens is a bit heavy but I do not mind trading a bit of weight for the lower aperture. I shoot mine on a tripod half the time which negates the weight.

All in all I am very happy with the investment. It goes wide to 17mm and shooting around 24-35mm it is absolutely splendid.

Example pic

   
Site Supporter

Registered: November, 2017
Posts: 442

1 user found this helpful
Lens Review Date: May 10, 2019 I can recommend this lens: Yes | Price: $529.00 | Rating: 9 

 
Pros: Clarity, Color-Reproduction, Quiet and Good Focus
Cons: Slightly Weighty, Off-Center Focus

I just got this lens, and decided to do some tests outside with it. All in all, an excellent lens. The attached photos from imgur, with the exception of cropping on the last, are entirely unedited. The last I cropped to show the excellent clarity of the lens. I find the bokeh slightly distracting, but that could be just in the particular photos. Otherwise, I recommend this lens highly.

https://imgur.com/a/c7zkEjj
   
Forum Member

Registered: April, 2018
Location: Tartu
Posts: 77

1 user found this helpful
Lens Review Date: March 18, 2019 I can recommend this lens: Yes | Price: $250.00 | Rating: 10 

 
Pros: Sharpness, build quality, quiet AF
Cons: no weather sealing; manual focus might be tricky
Sharpness: 9    Aberrations: 9    Bokeh: 9    Autofocus: 10    Handling: 10    Value: 10    New or Used: Used    Camera Used: K3   

It's well built, feels like a premium lens.
The AF is fast, accurate and almost soundless.
IQ is great and it's sharp.
Manual focus might be tricky due to short focus ring rotation distance.

I like this lens more than the Tamron 17-50.
   
Senior Member

Registered: July, 2018
Posts: 287
Lens Review Date: August 25, 2018 I can recommend this lens: Yes | Price: $405.00 | Rating: 7 

 
Pros: build quality, overall performance
Cons: problems with compatibility in some case, huge filter size, weight

I bought them as kit replacement. I shot with them about 1000 photos. I don't have luck. With K200D I had back focus and with K3 II I was problem with correct sharpening. It was not what I expected. Sometimes my camera place sharpeness further or nearer than I was expected. With 77 limited and 100 WR from Pentax I don't have this issue. After sold my buyer was happy and he don't have any problem. I see tested images from him and it was all rights.

Weight is the most noticable cons of the lens. It is a huge. In compatition with 77 limited or my macro 100WR lens it is make difference. After longer use you can feel weight. Big plus is excellent AF. It was working fast and it is the most silence. When screw driver in 77 make noticable noise you can take photos without making attention to yourselfs.

I use them for wide angle "macro". With Live View it was pleasure. Longer end it was quite nice for portrait. 2.8 stop is fully usefull. Only 77 limited is more sharpness. In comparision to standard kit II version is only better, but I want quick shift on this zoom to make them more operatable.

Switches small, not enought useful for me. I don't use it often. If you can buy in shop this model working well with you camera is good offer for this price. You should be aware, because some models has front or backfocus problem. Sometimes is not easy to correct via service. It is why I get them 7/10.
   
New Member

Registered: January, 2017
Posts: 10

1 user found this helpful
Lens Review Date: May 31, 2018 I can recommend this lens: Yes | Price: $220.00 | Rating: 10 

 
Pros: Great sharpness, focus, super in low light, versatility
Cons: A bit heavy, not WR
Sharpness: 10    Aberrations: 9    Bokeh: 9    Autofocus: 10    Handling: 9    Value: 10    New or Used: Used    Camera Used: K-S2   

I have had this lens for over a year, purchased used, and feel comfortable posting a recommendation here after hundreds of shots. It is my "go-to" lens, paired with a K-S2 for general travel and street-photography, including low-light sunrise and sunset landscapes up to the 50mm range, but particularly when I need a bit of width . The more I have used it, the more I have appreciated its sharpness, versatility, and handling.

Photo's are sharp, end-to-end; colors are excellent. As a non-pro enthusiast, for the money I get so close to what I would consider near-pro output that I could not be more pleased. This seems fairly consistent with the feedback from other posts here. Wish it were WR but can't have it all--with a rain hood have used on many hikes, wet and dusty conditions--no problems.

A great upgrade and highly recommended!
   
Veteran Member

Registered: February, 2010
Location: California
Posts: 1,602

1 user found this helpful
Lens Review Date: February 26, 2018 I can recommend this lens: Yes | Price: None indicated | Rating: 9 

 
Pros: Sharpness, colors, fast, overall value
Cons: Heavy, a bit bulky
Sharpness: 10    Aberrations: 9    Bokeh: 9    Autofocus: 9    Handling: 9    Value: 10    New or Used: New    Camera Used: K3ii   

This is a great lens to replace the kit. Almost the same focal lengths but with a constant f2.8, much better build quality and much better photo quality.

Sharpness: 10 - This lens is extremely sharp across the entire focal range.

Aberrations: 9 - I cannot notice any aberrations with my naked eye. When zooming in during post-processing I can notice a tiny bit so it's not prefect but close.

Bokeh; 9 - Beautiful and smooth bokeh. Since this is a fast lens it is easy to achieve the effect and looks very good.

Autofocus: 9 - Smooth and fast focusing. Pentax is known for being a bit behind on the AF curve so the 9 rating is relative to the camera. Could the focusing be faster
and a bit more smooth, sure, but this lens AF is just as good as most any other lens on my K3ii.

Handling: 10 - The build quality is very sturdy and feels very well build when holding it. It is a bit on the bulky side which is most noticeable when changing out this lens.

Value: 10 - Overall this is a great lens that can easily be found for under $400 which I think makes it an amazing value.
   
New Member

Registered: August, 2015
Location: Istanbul
Posts: 2

2 users found this helpful
Lens Review Date: February 15, 2018 I can recommend this lens: Yes | Price: $350.00 | Rating: 10 

 
Pros: Excellent sharpness
Cons: bit heavy, 77mm
Sharpness: 10    Aberrations: 10    Bokeh: 10    Autofocus: 9    Handling: 9    Value: 9    New or Used: New    Camera Used: Pentax K-5   


Trees by Yemen Ozan GŁndoğan, on Flickr



Fisherman by Yemen Ozan GŁndoğan, on Flickr



Back to Home by Yemen Ozan GŁndoğan, on Flickr



Kackar Mountains by Yemen Ozan GŁndoğan, on Flickr



HillSide by Yemen Ozan GŁndoğan, on Flickr



Sunset Malaga by Yemen Ozan GŁndoğan, on Flickr



Cyclops by Yemen Ozan GŁndoğan, on Flickr



Street Views by Yemen Ozan GŁndoğan, on Flickr



Jesus by Yemen Ozan GŁndoğan, on Flickr
   
Pentaxian

Registered: April, 2009
Location: Madrid, Spain
Posts: 6,214

7 users found this helpful
Lens Review Date: February 2, 2018 I can recommend this lens: Yes | Price: $225.00 | Rating: 9 

 
Pros: Well built, quiet auto focus, sharp in the centre from f/2.8, great colours and contrast
Cons: Zooms the wrong way, corners never really sharp, occasional flare, heavy, large 77mm filter size, erratic exposure
Sharpness: 9    Aberrations: 8    Bokeh: 8    Autofocus: 9    Handling: 9    Value: 9    New or Used: Used    Camera Used: K3   

I've owned the Tamron 17-50mm f/2.8 lens for quite a few years and it's my only other experience with a fast standard zoom on digital. I've always been pretty happy with the Tamron but longed for something better built and with quiet AF, so when I saw a copy of this Sigma for sale locally at a reasonable price I had to try it out and decided to buy. I prefer primes to zooms but a fast standard zoom is just so useful a lens to have that it's something I'd never want to be without.

I haven't owned the lens for long but used it a bit around christmas and on a recent trip to Italy it was my main lens, used 90% of the time, which always helps to get to know a new lens.

The lens is very well built. Compared to the Tamron, it's more solid (significantly bigger & heavier too) but the difference in build quality is clear, and that's something I appreciate. Unless you really need to minimise size and weight in such a lens, I'd say it's worth it to go for the Sigma.

Sharpness is excellent in the centre at all apertures, even wide open. At the corners you need to stop down to f/8 (or maybe even f/11) to get best results, though they never reach the sharpness levels of the centre, at least at the widest focal lengths. I may be being picky here - I've pixel-peeped the corners to check how they are but at normal display sizes they are absolutely nothing to worry about.

What has really impressed me with this lens' optical capabilities are the rich colours and contrast that photos have - they're probably as good as those from the DA limited (or other high quality modern primes). Blues especially seem to come out very well.

I've seen occasional flare even when using the hood but I had read about that before buying and it's not as bad as I had been expecting from the comments I've read. I've seen much, much worse on other lenses and overall I'd say it does pretty well in this regard.

The almost silent auto focus really is nice to have. In terms of accuracy I'd say it's slightly better than the Tamron, but only very slightly. It has the occasional slight mis-focus but that happens with all my lenses and I attribute it to the camera. The quiet AF is a luxury - nice to have but with no effect on the photos. This is my only K-mount lens with an inbuilt lens motor.

Overall, I'd say I'm very happy with the lens. It could be sharper in the corners, it could be a bit more resistant to flare and if it zoomed in the same direction as all my other lenses then that would be great, but these are relatively minor complaints. Compared to the Tamron I'd say it's optically on the same level. The Tamron might even have a slight edge with better sharpness in the corners and better flare resistance. In other aspects the Sigma is better - the AF motor, slightly more accurate AF, a slight advantage in colour and contrast, much better build quality. However, the size and weight differences are considerable and for those who like their equipment to be light, the Sigma may not be for you.

Update: I should mention that I have had a lot of problems with erratic exposure using this lens - either over or under exposure. On my trip to Italy I ended up using five-shot bracketing and deleting the four excess photos after choosing the best exposed one. I need to play around with some other exposure modes to see if the lens works better with them, but I'd recommend bracketing or using manual exposure and always shooting RAW when using this lens.

This really is a superb all-round lens which is very nearly as close to perfect for general use as it's possible to get.

I'll finish off with some sample images which I hope convey the results that this lens can achieve. The first three images were taken wide open.


Venice
by Jonathan MacDonald, on Flickr


Venice
by Jonathan MacDonald, on Flickr


Florence
by Jonathan MacDonald, on Flickr


IMGP3212a
by Jonathan MacDonald, on Flickr


Rome
by Jonathan MacDonald, on Flickr


Tuscany
by Jonathan MacDonald, on Flickr


Florence
by Jonathan MacDonald, on Flickr


ITLY3455b
by Jonathan MacDonald, on Flickr


ITLY3593a
by Jonathan MacDonald, on Flickr
   
Site Supporter

Registered: September, 2006
Location: Mississippi, USA
Posts: 808
Lens Review Date: January 1, 2018 I can recommend this lens: Yes | Price: $400.00 | Rating: 9 

 
Pros: Very Good Optics, constant f2.8, nice colors
Cons: Cheap lens cap
Sharpness: 9    Aberrations: 8    Bokeh: 9    Autofocus: 9    Handling: 9    Value: 10    New or Used: New    Camera Used: K-S2   

Really like this lens. Good walk around, quiet focus, Great colors.

It went back to Sigma for repair to AF, came back good as new. They were vague on repair but I suspect part came loose inside. Erratic focus with no adjustment.

Only complaint......Cheapest lens cap I've ever seen.
   
Junior Member

Registered: March, 2011
Location: Michigan
Posts: 29
Lens Review Date: October 23, 2017 I can recommend this lens: Yes | Price: $400.00 | Rating: 10 

 
Pros: Sharp images, speed (f/2.8), good ergonomics
Cons: About the only is mounting the lens hood on to the lens for storage

This is my "go-to" lens for my K-5. Worth every penny paid. One of my very best lenses. For most travel ventures I take this lens along with the DA*50-135mm f/2.8 along with my Tamron 1.4x TC and I am covered for most anything I photograph.
   
Veteran Member

Registered: July, 2007
Location: Queens, New York
Posts: 608

1 user found this helpful
Lens Review Date: October 18, 2017 I can recommend this lens: Yes | Price: $399.00 | Rating: 10 

 
Pros: Very sharp, silent and accurate autofocus
Cons: Heavy
Sharpness: 10    Aberrations: 9    Bokeh: 7    Autofocus: 10    Handling: 10    Value: 10    New or Used: New    Camera Used: K-01, K-50   

I was very satisfied with my Pentax DA16-45, but started thinking that having a similar range zoom with an f2.8 aperture would help with some indoor shots, so I began looking around, and noticed this Sigma.

This lens is noticeably sharper than the Pentax to the point that you have to soften almost every shot in Lightroom or other post processing software. The contrast is also higher than the Pentax, and the colors are not Pentax colors.

Not really something to complain about, but you should be aware of this before buying this lens.

On the pro side, the auto focus is accurate and silent, this lens' best virtue.

On the con side, it is heavy.

I think it is an excellent all-around, walk-around lens, because of its range and the silent auto focus.

I recommend this lens highly.

Mike Bokeh
   
Veteran Member

Registered: July, 2014
Location: Nagoya
Posts: 577

2 users found this helpful
Lens Review Date: November 6, 2016 I can recommend this lens: Yes | Price: $300.00 | Rating: 9 

 
Pros: Image quality, silent focusing, fast, good enough wide open
Cons: None for the price
Sharpness: 9    Aberrations: 8    Bokeh: 5    Autofocus: 9    Handling: 9    Value: 9    New or Used: New    Camera Used: K-S2   

Great lens. Replaced my 15mm Limited (17 has been wide enough for my needs in the end) and my 18-50 in one go. Sharp, silent and accurate focusing (needed -4 adjustment on K-S2 but spot on since then), nice rendering including at f2.8, plastic but solidly built - sometimes a little heavy - and feels like a quality product. Standard petal hood does its job. A little coma and some fringing at the wide end but that is easy to remove.
The f2.8 on this lens is for convenience and basic background separation - the bokeh on this lens is actually fairly unsatisfying and probably this lens' weakest point.

17mm f5.6
   
Senior Member

Registered: February, 2011
Location: Newport, South Wales
Posts: 173
Lens Review Date: September 8, 2016 I can recommend this lens: Yes | Price: $360.00 | Rating: 10 

 
Pros: Amazing value and great results
Cons: Fairly heavy
Sharpness: 10    Aberrations: 9    Bokeh: 8    Autofocus: 9    Handling: 9    Value: 10    New or Used: New    Camera Used: K-5 - K-3II   

My DA 16-45mm F4 was my 'go to' lens as it is a particularly good example but this is in another league.
   
New Member

Registered: January, 2012
Posts: 1
Lens Review Date: July 14, 2016 I can recommend this lens: Yes | Price: $400.00 | Rating: 9 

 
Pros: Sharp from 2.8, Nice colours and contrast, quiet AF
Cons:
Sharpness: 10    Aberrations: 9    Bokeh: 7    Autofocus: 8    Handling: 10    Value: 9    New or Used: Used    Camera Used: K-5   

Excellent lens.
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