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Sigma APO Teleconverter 1.4x EX DG for Pentax AF USA

B&H # SI1.4XDGPAF Mfr # 824109
No Longer Available
Product Highlights
  • Pentax AF Mount
  • Color Corrected Lens Elements
  • Designed for Use with Digital Cameras

The compact and lightweight (5.6 oz, 160 g) Sigma APO Teleconverter 1.4x EX DG is a high-quality extender that preserves the image quality of the lens it's mounted to and multiplies its focal length by 1.4x without any variation in the minimum focusing distance. This teleconverter, equipped with a Pentax AF mount, features Sigma's new multi-layer coating to reduce flare and ghosting, which is a common problem with digital cameras. Sigma recommends using this teleconverter with their DG series lenses for best performance.

The teleconverter will cut back the amount of light by one f/stop. For example using a 1.4x teleconverter with a 300mm f/2.8 lens will effectively increase the focal length to approximately 420mm and the f/2.8 aperture will now be f/4. Teleconverters are best used with longer telephoto lenses and are not recommended for lenses wider than 50mm, e.g. 28-105mm (35mm format).

Note: This teleconverter will only fit and work with a select list of lenses. Please click here compatibility chart for compatible lens chart.

Magnification 1.4x
Aperture Range f/2.8 - f/32
Lens Elements/Groups 5/3
Mount Pentax AF
Dimensions (L x D) 0.8 x 2.7" (19.5 x 68.5 mm) 1
Please Note:

Dimensions include the Sigma mount

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Weight 5.6 oz (160 g) 2
Please Note:

Weight includes Sigma mount

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Sigma APO Teleconverter 1.4x EX DG for Pentax AF
  • Front & Rear Lens Caps
  • Soft Case
  • 1-Year Worldwide Warranty + 3-Year Extended USA Warranty
  • REVIEW SNAPSHOT®

    by PowerReviews
    SigmaAPO Teleconverter 1.4x EX DG for Pentax AF
     
    2.8

    (based on 8 reviews)

    Ratings Distribution

    • 5 Stars

       

      (1)

    • 4 Stars

       

      (2)

    • 3 Stars

       

      (1)

    • 2 Stars

       

      (2)

    • 1 Stars

       

      (2)

    50%

    of respondents would recommend this to a friend.

    Reviewed by 8 customers

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    Displaying reviews 1-8

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    (1 of 2 customers found this review helpful)

     
    1.0

    Camera went crazy.

    By Juanjo

    from Miami, FL

    About Me Photo Enthusiast

    Verified Buyer

    Pros

      Cons

        Best Uses

          Comments about Sigma APO Teleconverter 1.4x EX DG for Pentax AF:

          I tried it on my Pentax Kx with my Sigma 70-200mm and camera went crazy, everything was flashing, of course no auto focus.
          I was able to take pictures but I was afraid it was going to damage my camera so I sent it back for a refund.

          • Was this a gift?:
          • No

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          (1 of 6 customers found this review helpful)

           
          1.0

          Not what I expected

          By Dickie

          from Santiago, Chile

          About Me Photo Enthusiast

          Verified Buyer

          Pros

            Cons

            • Not Functional

            Best Uses

              Comments about Sigma APO Teleconverter 1.4x EX DG for Pentax AF:

              It does work but with very few lenses, that I don't have any.
              That I discovered in the instructions of the product

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              (2 of 3 customers found this review helpful)

               
              5.0

              This product is worth more than I paid

              By Storm

              from Bellevue, Alberta, Canada

              About Me Semi-pro Photographer

              Verified Buyer

              Pros

              • Durable
              • Easy to Use
              • Improves Function
              • Lightweight

              Cons

                Best Uses

                • Landscapescenery
                • Wildlife

                Comments about Sigma APO Teleconverter 1.4x EX DG for Pentax AF:

                I use this with my 400 Sigma telephoto and it gives me just the extra I wanted. The images are sharp and clear. Works exactly as advertised unlike my other teleconverter. I couldn't be happier with the product.

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                (2 of 9 customers found this review helpful)

                 
                3.0

                incompatible with Pentax 55-300

                By long-time Pentax user

                from Albuquerque

                About Me Semi-pro Photographer

                Verified Buyer

                Pros

                  Cons

                    Best Uses

                      Comments about Sigma APO Teleconverter 1.4x EX DG for Pentax AF:

                      Three stars was my only possible choice because this type of converter is structurally incompatible with this type of lens, so I could neither approve of it nor disapprove of it. The teleconverter's front element is essentially flush with its lens mount plane, and the rear unmovable element of the lens is flush with the rear of the lens's mounting plane.

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                      (1 of 2 customers found this review helpful)

                       
                      4.0

                      Awesome product and wonderful experience

                      By Carlos

                      from Philadelphia, PA

                      About Me Hobbyist/Enthusiast

                      Verified Buyer

                      Pros

                      • Consistent Output

                      Cons

                        Best Uses

                        • General Use
                        • Wildlife

                        Comments about Sigma APO Teleconverter 1.4x EX DG for Pentax AF:

                        The focus, like all that I have purchased from Sigma, is awesome. I am using it in combination with a 70/200 mm.

                        It was my first purchase experience with B&H. Wonderful! I am more than happy.

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                        (3 of 6 customers found this review helpful)

                         
                        2.0

                        Not compatible - dont bother

                        By bhiii

                        from kaysville, utah

                        Verified Buyer

                        Comments about Sigma APO Teleconverter 1.4x EX DG for Pentax AF:

                        Could not use.

                        Would not work with my new Sigma 70-200mm F2.8 DX II HSM lens on my Pentax K10D. Very dissappointed especially to the fact that this is not a well advertised or know fact.

                        Had to return and hope someday Sigma accomodates this issue to apease us Pentaxians. Gotta love being a minority. So much for converting a very good 70-200mm f2.8 lens.

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                        (3 of 3 customers found this review helpful)

                         
                        2.0

                        Weak Connection between camera and lense

                        By MSmith

                        from South Florida

                        Verified Buyer

                        Comments about Sigma APO Teleconverter 1.4x EX DG for Pentax AF:

                        Generally product works, but there are times when the focus motor will hang up and also there are times when the camera will not recognize the lens (and f4 100-300mm Sigma) and I get the F- symbol. I then have to move the connections around to get a good mate.

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                        (7 of 9 customers found this review helpful)

                         
                        4.0

                        No complaint suggesting it to a friend

                        By Leo

                        from Arlington, TX

                        About Me Hobbyist/Enthusiast

                        Verified Buyer

                        Pros

                        • Easy to Use
                        • Lightweight

                        Cons

                          Best Uses

                          • Traveling

                          Comments about Sigma APO Teleconverter 1.4x EX DG for Pentax AF:

                          I’m using it with Sigma 70-200, f 2.8; up to now for shooting animals/ birds in a Zoo. The result in my opinion is superb with both film (Pentax MZs) and digital (Pentax K20D).
                          The great surprise using it for the first time is that you don’t fill having changed your original lens, not event the viewfinder’s light; but the increased enlargement is there!
                          I haven’t found anything wrong with it yet…

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