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Sigma 18-50mm f/2.8-4.5 DC HSM Zoom For Pentax D-SLRs

B&H # SI185028DOP Mfr # 861109
No Longer Available
Product Highlights
  • Large Aperture Zoom
  • Designed for Digital SLR Cameras
  • Internal Focusing System
  • Compact and Lightweight
  • HSM Autofocusing

The Sigma 18-50mm f/2.8-4.5 DC HSM Zoom For Pentax D-SLRs is a lens dedicated to digital SLR cameras with APS-C size image sensors offering a large aperture and provides a high level of optical performance. The large aperture of f/2.8 makes capturing exceptional photos in low light achievable, and the wide angle is well suited for indoor photography. It offers superior peripheral brightness as well as a compact and lightweight construction. Two SLD (Special Low Dispersion) glass elements and three Aspherical lenses provide excellent correction for all types of aberrations. The Super Multi-Layer Coating reduces flare and ghosting. Designed with inner focusing and inner zooming systems, high image quality is assured throughout the entire zoom range. This lens has a minimum focusing distance of 11.8 inches (30cm) throughout the entire zoom range and a maximum magnification ratio of 1:4.1.

Note! 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.

HSM Autofocusing for Pentax D-SLR Cameras
Inner Focus System
An inner focusing system eliminates front lens rotation, making the lens particularly suitable for using the petal-type lens hood (supplied) plus circular polarizing filters.
Excellent optical design
Special Low Dispersion (SLD) and Extraordinary Low Dispersion (ELD) glass elements provide excellent correction of color aberrations. This lens produces an exceptional level of optical performance.
Reduced Ghosting and Flare
The super multi-layer lens coating reduces flare and ghost. High image quality is assured throughout the entire zoom range.
Ideal For Portraits and Snaps
With a minimum focusing distance of 7.9", and a maximum magnification of 1:3, this large aperture standard zoom lens, with close-up ability, is ideal for portrait and snap shots.
Compact and Lightweight Lens
Its design incorporates both glass-mold and hybrid aspherical lens technology which offers a compact and lightweight construction.
Performance
Focal Length 18 - 50mm
Aperture Maximum: f/2.8 - 4.5
Minimum: f/22
Camera Mount Type Pentax K
Format Compatibility Pentax Digital (APS-C)
Angle of View 69.3° - 27.9°
Minimum Focus Distance 11.8" (29.97 cm)
Magnification 0.24x
Maximum Reproduction Ratio 1:4
Elements/Groups 16/12
Diaphragm Blades 7
Features
Image Stabilization Yes
Autofocus Yes
Tripod Collar No
Environmental
Physical
Filter Thread 67 mm
Dimensions (DxL) Approx. 2.91 x 3.49" (7.39 x 8.86 cm)
Weight 13.93 oz (395 g)
Sigma 18-50mm f/2.8-4.5 DC HSM Zoom For Pentax D-SLRs
  • Petal-Type Lens Hood
  • 3-Year USA Warranty
  • REVIEW SNAPSHOT®

    by PowerReviews
    Sigma18-50mm f/2.8-4.5 DC HSM Zoom For Pentax D-SLRs
     
    4.4

    (based on 8 reviews)

    Ratings Distribution

    • 5 Stars

       

      (4)

    • 4 Stars

       

      (3)

    • 3 Stars

       

      (1)

    • 2 Stars

       

      (0)

    • 1 Stars

       

      (0)

    88%

    of respondents would recommend this to a friend.

    Pros

    • Fast / accurate auto-focus (5)
    • Consistent output (3)
    • Easily interchangeable (3)
    • Strong construction (3)

    Cons

      Best Uses

      • Landscape/scenery (5)
      • Low light (3)
      • Night photography (3)
      • Weddings (3)
        • Reviewer Profile:
        • Casual photographer (3)
        • Was this a gift?:
        • No (6)

      Reviewed by 8 customers

      Sort by

      Displaying reviews 1-8

      Back to top

      (0 of 2 customers found this review helpful)

       
      3.0

      Waste of money

      By Morag

      from Adelaide, South Australia

      About Me Casual Photographer

      Verified Buyer

      Pros

      • Fast / accurate auto-focus

      Cons

      • Heavy
      • Tough To Attach

      Best Uses

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

      Comments about Sigma 18-50mm f/2.8-4.5 DC HSM Zoom For Pentax D-SLRs:

      Can't detect any difference in image quality between this lens and the kit lens.
      Supposedly a stop faster than the kit lens, but camera uses same shutter speed as kit lens with narrower aperture.
      Built-in stabilisation superfluous with Pentax camera. This lens is substantially larger than the kit lens, to the point where I'm reluctant to use it because of its conspicuousness and awkwardness.

      • Was this a gift?:
      • No

      Share this review

       
      5.0

      Quality at a good price

      By Lubos

      from Prague, Czech republic

      About Me Semi-pro Photographer

      Verified Buyer

      Pros

      • Fast / accurate auto-focus
      • Lightweight

      Cons

        Best Uses

        • Landscape/Scenery
        • Wildlife Photos

        Comments about Sigma 18-50mm f/2.8-4.5 DC HSM Zoom For Pentax D-SLRs:

        Excellent standard lens. Perfect drawing throughout the zoom range. Well replace objetive supplied with the camera. I can only recommend.

        • Was this a gift?:
        • Yes

        Share this review

        (1 of 1 customers found this review helpful)

         
        5.0

        Great lens for the price

        By Memo

        from Mexico city

        About Me Semi-pro Photographer

        Verified Buyer

        Pros

          Cons

            Best Uses

            • Landscape/Scenery
            • Weddings/Events

            Comments about Sigma 18-50mm f/2.8-4.5 DC HSM Zoom For Pentax D-SLRs:

            I find this lens very good for the price. I think it is sharper than the kit lens and with the advantage of having f2.8 at 18mm. This is the third Sigma lens that i have used so far and i think they are of very good quality. It is not perfect but for the price i doubt very much that there is something better.

            • Was this a gift?:
            • No

            Share this review

            (1 of 5 customers found this review helpful)

             
            5.0

            Sigma is good products

            By Harry

            from philadelphia

            About Me Photo Enthusiast

            Verified Buyer

            Pros

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

            Cons

              Best Uses

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

              Comments about Sigma 18-50mm f/2.8-4.5 DC HSM Zoom For Pentax D-SLRs:

              This agreat product with that price

              • Was this a gift?:
              • No

              Share this review

              (2 of 2 customers found this review helpful)

               
              5.0

              NICE!!!!!!!!!!!!!!!!!!!!!!!

              By Daggy

              from New York City

              About Me Casual Photographer

              Verified Buyer

              Pros

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

              Cons

                Best Uses

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

                Comments about Sigma 18-50mm f/2.8-4.5 DC HSM Zoom For Pentax D-SLRs:

                Will use in small events / family / portraits photos.
                Its VERY QUIET, not heavy.

                Overall, will use in small events / family photos and portrait. No Complaints.

                • Was this a gift?:
                • No

                Share this review

                (3 of 3 customers found this review helpful)

                 
                4.0

                Good replacement for kit lense

                By epa

                from Hormigueros, PR

                About Me Photo Enthusiast

                Pros

                • Inner Focusing
                • Pretty Good Bokeh
                • Quiet focus

                Cons

                • Expected HSM to be faster

                Best Uses

                • Walk around lens

                Comments about Sigma 18-50mm f/2.8-4.5 DC HSM Zoom For Pentax D-SLRs:

                I find the lens pretty sharp wide open at f/2.8, I had the DC Macro Non-HSM a while back and its actually a bit sharper than it. I like the fact that lens does not extend when you change focal length.

                Due to the HSM it is very quiet as you expect, but I did not find the focusing to be that much faster than the screwdrive mechanism type lens. I also did not find that much of a difference between the OS and the body SR. Overall I find the lens a good replacement for the kit lens and a good deal for the price.

                The lens does not have the red dot on the back to use for reference when mounting to the body, but you can use the white dot for focal length as a a reference point when mounting it to the body.

                Obviously one wishes it had a max aperture of f/2.8 throughout the range, but you can't complain for the price, also you can push the K-5 ISO quite a bit so its no problem in terms of shutter speed.

                • Was this a gift?:
                • No

                Share this review

                (2 of 4 customers found this review helpful)

                 
                4.0

                Sigma is a good choice!

                By Durwoodall

                from Smithfield,NC

                About Me Casual Photographer

                Verified Buyer

                Pros

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

                Cons

                • Tough To Attach

                Best Uses

                • Landscape/Scenery
                • Sports/Action
                • Wildlife Photos

                Comments about Sigma 18-50mm f/2.8-4.5 DC HSM Zoom For Pentax D-SLRs:

                I wondered why my digital camera was yielding pictures of average sharpness. To get more reach at sports events, I purchased a 300mm sigma lens to replace the 200 mm kit lens from pentax. I immediately noticed an improvement. So I replaced my other kit lens with the above sigma lens. I now get the sharpness that the camera should deliver. Sigma lens is a good choice!!

                • Was this a gift?:
                • No

                Share this review

                (8 of 8 customers found this review helpful)

                 
                4.0

                Just what I was hoping for

                By b0bg

                from San Francisco, CA

                Verified Buyer

                Pros

                • Accurate focus
                • Fast Focus
                • Quiet Focus

                Cons

                • F28 disappears quickly

                Best Uses

                • Good city walking lens

                Comments about Sigma 18-50mm f/2.8-4.5 DC HSM Zoom For Pentax D-SLRs:

                This is a solid lens. I'm not 100% convinced the OS in this lens is an improvement over the body image stabilization, but it seems to be roughly equivalent.

                Focus is fast and accurate. F/2.8 goes away by ~20mm but a significant improvement over the Pentax 18-55mm kit lens.

                I am glad to have made this purchase.

                Share this review

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