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Sigma 10-20mm f/3.5 EX DC HSM Autofocus Zoom Lens for Pentax

You Pay: $649.00
Product Highlights
  • Zoom Super Wide Angle
  • Two ELD Glass Elements
  • Fast and Silent HSM AF
  • Robust Construction
  • Made in Japan

The Sigma 10-20mm f/3.5 EX DC HSM Autofocus Zoom is a super-wide angle lens with a relatively bright f/3.5 maximum aperture throughout its zoom range, helping to ensure high image quality. The lens gathers enough light to make it a great choice for indoor shooting as well as landscapes and creative portraiture. This version of the lens is exclusively made to fit the Pentax lens mount. It is not intended for use in "full frame" digital SLR cameras, or for any film-based cameras.

With a wide angle viewing range of 102.4-63.8°, this lens can empower a photographer to produce creative images with exaggerated perspective. Its Super Multi-Layer coating reduces flare and ghosting. The HSM autofocus motor provides quiet, high speed operation. You can also shoot with manual focus.

The 10-20 f/3.5 EX DC HSM incorporates an inner focusing system to eliminate front lens rotation, which enables the lens to use the included petal-type bayonet hood to eliminate extraneous light from striking the front of the optic. Two ELD (Extraordinary Low Dispersion) glass elements and a SLD (Special Low Dispersion) glass element provide excellent color fidelity, and 4 aspherical lens elements provide correction for common distortions.

This lens has a minimum focusing distance of 9.4" (24cm) throughout the entire zoom range, and a maximum magnification ratio of 1:6.6.

Note! Vignetting will occur if the lens is used with 35mm SLR cameras or digital cameras with image sensors larger than APS-C size

Super-Wide
Broad 10-20mm zoom range is ideally suited to tight interiors or expansive landscapes with "APS-C" type digital SLRs
High Image Quality
Two ELD (Extraordinary Low Dispersion) glass elements, one SLD (Special Low Dispersion) glass element, and 4 aspherical lens elements help render undistorted scenes with true color
Fast and Silent AF
Sigma's best HSM autofocus allows for quick operation that's barely audible, along with fulltime manual override
EX Build Quality
Sigma "EX" lenses feature robust construction appropriate for demanding professional use and are backed with a 4-year warranty against manufacturer defects for USA customers
Made in Japan
The 10-20 f/3.5 EX DC HSM is made in Sigma's Japanese factory
Performance
Focal Length 10 - 20mm
Aperture Maximum: f/3.5
Minimum: f/22
Camera Mount Type Pentax K
Format Compatibility Pentax Digital (APS-C)
Angle of View 102.4° - 63.8°
Minimum Focus Distance 9.4" (23.88 cm)
Magnification 0.15x
Maximum Reproduction Ratio 1:7
Elements/Groups 13/10
Diaphragm Blades 7
Features
Image Stabilization No
Autofocus Yes
Tripod Collar No
Environmental
Physical
Filter Thread 82 mm
Dimensions (DxL) Approx. 3.4 x 3.5" (8.64 x 8.89 cm)
Weight 1.14 lb (520 g)
Sigma 10-20mm f/3.5 EX DC HSM Autofocus Zoom Lens for Pentax
  • Lens Hood
  • Front & Rear Lens Caps
  • Limited 1-Year North and South America Warranty Against Manufacturing and Workmanship Defects.
  • Limited 3-Year U.S.A. Extended Warranty Extension Against Manufacturing and Workmanship Defects.
  • REVIEW SNAPSHOT®

    by PowerReviews
    Sigma10-20mm f/3.5 EX DC HSM Autofocus Zoom Lens for Pentax
     
    4.7

    (based on 16 reviews)

    Ratings Distribution

    • 5 Stars

       

      (11)

    • 4 Stars

       

      (5)

    • 3 Stars

       

      (0)

    • 2 Stars

       

      (0)

    • 1 Stars

       

      (0)

    100%

    of respondents would recommend this to a friend.

    Pros

    • Fast / accurate auto-focus (10)
    • Durable (9)
    • Strong construction (9)
    • Consistent output (7)
    • Easily interchangeable (7)

    Cons

    • Heavy (5)

    Best Uses

    • Landscape/scenery (13)
    • Low light (8)
    • Night photography (8)
    • Weddings (5)
    • Wildlife photos (3)
      • Reviewer Profile:
      • Photo enthusiast (10), Semi-pro photographer (4)
      • Was this a gift?:
      • No (11)

    Reviewed by 16 customers

    Sort by

    Displaying reviews 1-16

    Back to top

     
    4.0

    Maybe not really worth the money

    By Jansune

    from Lund, Sweden

    About Me Photo Enthusiast

    Verified Buyer

    Pros

    • Easily Interchangeable
    • Fast / accurate auto-focus

    Cons

    • Heavy

    Best Uses

      Comments about Sigma 10-20mm f/3.5 EX DC HSM Autofocus Zoom Lens for Pentax:

      Great lens for architecture. As it is very soft in the corners at 3.5, I could really manage with Sigma's cheaper lens.

      But the lens is OK

      • Was this a gift?:
      • No

      Share this review

       
      5.0

      Good quality WA lens

      By William Whelan

      from Punta Gorda Florida

      Comments about Sigma 10-20mm f/3.5 EX DC HSM Autofocus Zoom Lens for Pentax:

      I considered getting the Pentax UW zoom. All ratings, however, placed this above the Pentax. Has proved to be the right choice.

      Share this review

      (1 of 1 customers found this review helpful)

       
      4.0

      Great lens

      By Robin Pu

      from Toronto

      About Me Photo Enthusiast

      Verified Reviewer

      Pros

      • Durable
      • Strong Construction

      Cons

      • Heavy

      Best Uses

      • Landscape/Scenery
      • Night Photography

      Comments about Sigma 10-20mm f/3.5 EX DC HSM Autofocus Zoom Lens for Pentax:

      The reason I brought this lens is because I need a wide lens for my Pentax K5ii. I shot landscape by this lens and it is great at f8. Talk about the bad side. It is quite heavy, compares to usual Pentax lens. But if you use it with the battery grip? OMG, can't be better. The weight balance just perfect. If you are looking forward to a wide lens foe landscape, I will suggest this one. If you want wider, I will suggest Rokinon 8mm f3.5. Conclude, great lens that you should have.

      • Was this a gift?:
      • No

      Share this review

       
      5.0

      Good wide angle lens

      By psandeep.dwh

      from Norristown, PA

      Comments about Sigma 10-20mm f/3.5 EX DC HSM Autofocus Zoom Lens for Pentax:

      Nice wide angle lens. I am mainly using it for real estate photography.

      Share this review

      (1 of 1 customers found this review helpful)

       
      5.0

      Impressive Quality

      By Fossil56

      from Lock Haven, Pa.

      About Me Semi-pro Photographer

      Verified Buyer

      Pros

      • Durable
      • Fast / accurate auto-focus
      • Lightweight
      • Nice Bokeh
      • Rugged
      • Strong Construction

      Cons

        Best Uses

        • Landscape/Scenery
        • Night Photography
        • Video

        Comments about Sigma 10-20mm f/3.5 EX DC HSM Autofocus Zoom Lens for Pentax:

        I hesitated at first on choosing this lens over the f/4.5 version or the Sigma 8-16mm. I wanted the extra stop over the 4.5 and I didn't like the idea of not being able to use filters like the 8-16mm. Sure you can buy a cumbersome attachment that allows you to use square filters on the 8-16mm but I wanted a walk-around quick lens that was relatively compact. I shoot a lot of classic cars which I haven't done yet with lens since its winter here in the northeast. The shots I have gotten with this lens look pretty sharp and these were handheld. I normally shoot with a tripod but my initial tests were handheld. I have a Pentax K3 Limited Silver Edition. The lens seems to work quite well with this camera. Focusing is quick, the lens feels well made and solid, and the controls are smooth. The price was great and it was exactly what I was looking for. I have enclosed a couple of photos taken with this lens. I will definitely look at other Sigma lenses for future purchase at B&H.

        • Was this a gift?:
        • No

        Share this review

         
        4.0

        Another winner from Sigma

        By DocPantload

        from New Haven, CT

        About Me Photo Enthusiast

        Verified Buyer

        Pros

        • Consistent Output
        • Durable
        • Fast / accurate auto-focus
        • Rugged
        • Strong Construction

        Cons

          Best Uses

          • Indoors/Low Light
          • Landscape/Scenery
          • Night Photography
          • Weddings/Events

          Comments about Sigma 10-20mm f/3.5 EX DC HSM Autofocus Zoom Lens for Pentax:

          Much less distortion than expected. Sharp, with plenty of contrast.

          • Was this a gift?:
          • No

          Share this review

          (3 of 3 customers found this review helpful)

           
          4.0

          Ultra Wide for Pentax by Sigma

          By Voxdude

          from Toronto, Canada

          About Me Photo Enthusiast

          Verified Buyer

          Pros

          • Durable
          • Easily Interchangeable
          • Fast / accurate auto-focus
          • Nice Bokeh

          Cons

            Best Uses

            • Landscape/Scenery
            • Video
            • Weddings/Events
            • Wildlife Photos

            Comments about Sigma 10-20mm f/3.5 EX DC HSM Autofocus Zoom Lens for Pentax:

            This lens is amazing. It is clear, responds well with auto-f and has an great wide focus.
            Used it for portraits, scene work and holiday fun.
            The price was also in line...

            • Was this a gift?:
            • Yes

            Share this review

            (5 of 5 customers found this review helpful)

             
            4.0

            Excellent and Wonderful for creativity

            By Kiwi Jono

            from Christchurch, New Zealand

            About Me Photo Enthusiast

            Pros

            • Constant F35
            • Nice Bokeh
            • Nice Feel To It
            • Srew On Filter Possible
            • Strong Construction

            Cons

            • Corners Sometimes Soft

            Best Uses

            • Creative Photography
            • Indoors/Low Light
            • Landscape/Scenery
            • Night Photography

            Comments about Sigma 10-20mm f/3.5 EX DC HSM Autofocus Zoom Lens for Pentax:

            First up, I have a small selection of lenses now and this is definitely my favorite lens at the moment.

            The build is excellent. Nice feel to the zoom ring and manual focus is pretty reasonable (for an AF lens). The 82mm thread may seem like a disadvantage but in fact has the advantage that I can use a filter without vignetting.

            Optically its very good. The frame center is sharp from f3.5 across the zoom range. My only criticism is that corners can be soft from 10mm - 14mm below f5.6 but acceptably sharp by f8 (even extreme corners). Importantly it does have a usable f3.5 and from 15mm - 20mm it is sharp across the frame from f3.5 (in fact it a much better lens than my Sigma 17-70 in the 17-20mm range).
            Bokeh is good but you have to be VERY close to your subject to see it.

            Overall I love this lens and it opens up a lot of creative possibilities. I would rate the sharpness 4 stars and everything else are 5 star but can't give it 4.5 so putting 4 stars.

            • Was this a gift?:
            • No

            Share this review

            (3 of 3 customers found this review helpful)

             
            5.0

            Nice alternative to the 10-17

            By couliseaux

            from Florence, KY

            About Me Semi-pro Photographer

            Verified Buyer

            Pros

            • Durable
            • Rugged
            • Strong Construction

            Cons

            • Poor in Low Light

            Best Uses

            • Indoors/Low Light
            • Landscape/Scenery
            • Night Photography
            • Weddings/Events

            Comments about Sigma 10-20mm f/3.5 EX DC HSM Autofocus Zoom Lens for Pentax:

            I have used both the Sigma 10-20 and the Pentax 10-17. I loved the 10-17 but decided when I had the funds to rebuy that I wanted to spring for the sigma due to the constant aperature and HSM, both are upgrades from the Pentax.
            I find the HSM to be slightly slower than the screw drive on the Pentax. Not terrible but noticible. The sigma corrects for distortion, whereas the Pentax does not. This is neither good nor bad, unless you have a preference in this area. I found the Pentax 10-17 to be more of a fun lens where the sigma is practical.
            For a workhorse, pick the Sigma, it's silent and has the constant 3.5 plus distortion correction. If you want a smaller fun lens go with the Pentax, the fisheye on the short end is lots of fun, but it's slower and noisier.

            • Was this a gift?:
            • No

            Share this review

            (2 of 2 customers found this review helpful)

             
            5.0

            My 1st UWA

            By Lex Madera

            from Virginia

            About Me Photo Enthusiast

            Verified Buyer

            Pros

            • Consistent Output
            • Durable
            • Strong Construction

            Cons

              Best Uses

              • Landscape/Scenery
              • Weddings/Events
              • Wildlife Photos

              Comments about Sigma 10-20mm f/3.5 EX DC HSM Autofocus Zoom Lens for Pentax:

              This is my 1st ultra-wide angle lens. I have no regrets I selected it, quite the contrary. Although I've only had a short time to put it through its paces, I'm impressed thus far. Some might consider it heavy but it is solid and I appreciate that. This is my 2d lens, and certainly not the last I will invest in for my Pentax bodies.

              • Was this a gift?:
              • No

              Share this review

              (2 of 2 customers found this review helpful)

               
              5.0

              Very good lens for an advanced amateur

              By BobE

              from New York

              About Me Photo Enthusiast

              Verified Buyer

              Pros

              • Consistent Output
              • Easily Interchangeable
              • Fast / accurate auto-focus
              • Nice Bokeh

              Cons

              • Heavy

              Best Uses

              • Indoors/Low Light
              • Landscape/Scenery

              Comments about Sigma 10-20mm f/3.5 EX DC HSM Autofocus Zoom Lens for Pentax:

              As a somewhat advanced amateur, I appreciate the added scope in focal length that this wide angle, rectalinear lens lends to my 'kit,' which now include this 10mm-20mm, 17mm-70mm, 50mm-200mm, and 300mm. I use a Pentax SLR and the Sigma lenses make a fine and economical contribution.

              The constant f/3.5 aperture provides good lower-light (fog for instance) capability with focal flexability for composing a wide landscape scene. I have found the results clear and cridp, with very good contrast that alows flexibility in post processing.

              All in all, I like this lens a lot and consider it a staple of my personal lens choices. A good value--not the least expensive wide angle, but a fine value for my Pentax given its constant aperture.

              • Was this a gift?:
              • Yes

              Share this review

              (1 of 1 customers found this review helpful)

               
              5.0

              A good compromise UW zoom range

              By Garfish

              from The Great Pacific North West

              About Me Photo Enthusiast

              Verified Buyer

              Pros

              • Consistent Output
              • Durable
              • Easily Interchangeable
              • Fast / accurate auto-focus
              • Rugged
              • Strong Construction

              Cons

              • 82mm filters
              • Heavy

              Best Uses

              • Indoors/Low Light
              • Landscape/Scenery
              • Night Photography

              Comments about Sigma 10-20mm f/3.5 EX DC HSM Autofocus Zoom Lens for Pentax:

              The 1st copy I got had malfunctioning AF, but the 2nd is just fine and AF works well. I will use this lens extensively at our local marina to do "boat portraits" and wide scenics-- and also for landscapes and interiors. At the marina, the boats are packed in pretty tightly and it takes an ultra-wide to open it up. This lens is sharp, contrasty and the constant f3.5 aperture is useful for night work. The lens is well built, but on the downside, it is sort of big and heavy-- about the size and weight of a good 24-75 f2.8. It take 82mm filters which are spendy.

              • Was this a gift?:
              • No

              Share this review

              (2 of 2 customers found this review helpful)

               
              5.0

              A high quality fun lens to use

              By Garfish of Earth

              from The Great Pacific Northwest

              About Me Photo Enthusiast

              Verified Buyer

              Pros

              • Consistent Output
              • Durable
              • Easily Interchangeable
              • Fast / accurate auto-focus
              • Rugged
              • Strong Construction

              Cons

              • Heavy

              Best Uses

              • Indoors/Low Light
              • Landscape/Scenery
              • Night Photography

              Comments about Sigma 10-20mm f/3.5 EX DC HSM Autofocus Zoom Lens for Pentax:

              I shoot a lot at our local boat basin/marina and when on the docks shooting is tough because the boats are packed in pretty tightly. Well, this lens really opens things up and makes individual "boat portraits" not only possible but also exciting-- provides interesting perspective distortion. One has to get used to that and use it as appropriate. It also makes a useful landscape lens when a good foreground can be found. Finally, it really opens up enclosed spaces, i.e. interiors. Curvilinear (barrel) distortionis only slight-moderate. This lens is good sized w/ 82mm filter, and on the heavy side, but balances well on a dslr, and it is well built.

              • Was this a gift?:
              • No

              Share this review

              (1 of 1 customers found this review helpful)

               
              5.0

              I love it

              By stian

              from san francisco

              About Me Semi-pro Photographer

              Pros

              • Durable
              • Fast / accurate auto-focus

              Cons

                Best Uses

                • Landscape/Scenery
                • Parties
                • Small rooms

                Comments about Sigma 10-20mm f/3.5 EX DC HSM Autofocus Zoom Lens for Pentax:

                really great for expanding space.
                I use it as a shoot from the hip lens at parties.
                quiet and fast auto focus
                nice construction.. built to last.
                very fun lens!

                • Was this a gift?:
                • No

                Share this review

                 
                5.0

                [...]

                By Ev

                from Chilliwack, B.C.

                About Me Photo Enthusiast

                Verified Buyer

                Pros

                • Consistent Output
                • Easily Interchangeable
                • Fast / accurate auto-focus
                • Lightweight

                Cons

                  Best Uses

                  • Indoors/Low Light
                  • Landscape/Scenery
                  • Macro Photography
                  • Weddings/Events

                  Comments about Sigma 10-20mm f/3.5 EX DC HSM Autofocus Zoom Lens for Pentax:

                  [...]I like to take family groupings and floral gardens and already this lens has performed flawlessly. I have been more than satisfied with how smooth it functions giving me some great photos.

                  • Was this a gift?:
                  • No

                  Share this review

                  (6 of 7 customers found this review helpful)

                   
                  5.0

                  No regrets buying this lens!

                  By Puma

                  from Windsor, CT

                  About Me Semi-pro Photographer

                  Verified Buyer

                  Pros

                  • Consistent Output
                  • Easily Interchangeable
                  • Fast / accurate auto-focus
                  • Strong Construction

                  Cons

                    Best Uses

                    • Indoors/Low Light
                    • Landscape/Scenery
                    • Night Photography
                    • Wildlife Photos

                    Comments about Sigma 10-20mm f/3.5 EX DC HSM Autofocus Zoom Lens for Pentax:

                    This lens is absolutely great for scenery and landscape. I did a lot of research for a good wide-angle lens and for the price this lens was definitely my favorite. It makes any picture look more artistic, use it with any subject! I almost never take it off my camera.

                    Share this review

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