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Sigma 500mm f/4.5 EX DG APO Autofocus Lens for Pentax AF

B&H # SI50045DGPAF MFR # 184109 USA
Sigma 500mm f/4.5 EX DG APO Autofocus Lens for Pentax AF

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Product Highlights

  • Super Telephoto Prime Lens
  • Aperture Range: f/4.5-32
  • Hyper-Sonic Motor
  • Inner Focusing System
  • Extra Low Dispersion Elements
  • Fits Full-Frame and APS-C Sensors
  • For Pentax K Mount
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You Pay: $4,999.00

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This Sigma 500mm f/4.5 EX DG APO lens is an Apochromatic ultra-telephoto lens with a fast f/4.5 maximum aperture, and it incorporates two ELD (Extraordinary Low Dispersion) glass elements to reduce chromatic aberration to a minimum. Internal focus enables responsive and fast autofocus speed.

The improved DG lens design corrects for various aberrations. This lens is specially coated to get the best color balance whilst cutting down on ghosting caused by reflections from the digital image sensor. The lens provides the utmost correction against lateral chromatic aberration which is a serious problem for digital SLR cameras.

By adding the optional Sigma APO teleconverter, you can use this lens as a 700mm f/6.3 MF ultra-telephoto lens with a 1.4x EX teleconverter, or as a 1000mm f/9 MF ultra-telephoto lens with a 2x teleconverter.

EX lens series denotes excellence of engineering and new technology.
A rotatable 46mm drop-in filter holder in the rear part of the lens barrel facilitates the use of filters including a polarizing filter.
Performance
Focal Length 500mm
Aperture Maximum: f/4.5
Minimum: f/32
Camera Mount Type Pentax K
Format Compatibility 35mm Film / Full-Frame Digital Sensor
Pentax Digital (APS-C)
Angle of View
Minimum Focus Distance 13.12' (4.00 m)
Magnification 0.12x
Maximum Reproduction Ratio 1:8
Elements/Groups 11/8
Diaphragm Blades 9
Features
Image Stabilization No
Autofocus Yes
Tripod Collar Yes
Environmental
Physical
Filter Thread Rear:46 mm
Dimensions (DxL) Approx. 4.8 x 13.8" (12.19 x 35.05 cm)
Weight 6.82 lb (3.09 kg)
Sigma Telephoto 500mm f/4.5 EX DG APO Autofocus Lens for Pentax AF
  • Front Slip-on Lens Cap
  • Rear Lens Cap
  • Lens Hood
  • Soft Case
  • Two 46mm Rear Drop-In Filters:
  • Circular Polarizer
  • Normal (UV)
  • Front Protective Filter
  • 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
    Sigma500mm f/4.5 EX DG APO Autofocus Lens for Pentax AF
     
    5.0

    (based on 5 reviews)

    Ratings Distribution

    • 5 Stars

       

      (5)

    • 4 Stars

       

      (0)

    • 3 Stars

       

      (0)

    • 2 Stars

       

      (0)

    • 1 Stars

       

      (0)

    100%

    of respondents would recommend this to a friend.

    Pros

    • Easy to use (4)
    • Durable (3)

    Cons

      Best Uses

          • Reviewer Profile:
          • Enthusiast (3)
          • Was this a gift?:
          • No (3)

        Reviewed by 5 customers

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        Displaying reviews 1-5

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        5.0

        Great Lens!

        By Pentax Shooter

        from Rio Grande Valley, Texas

        About Me Hobbyist/Enthusiast

        Verified Buyer

        Pros

        • Durable
        • Easy To Use
        • Reliable

        Cons

          Best Uses

            Comments about Sigma 500mm f/4.5 EX DG APO Autofocus Lens for Pentax AF:

            I've testing this lens for a week now and I cannot find any faults with it. I use it on my Pentax K-3 for wildlife photography. The lens is tack sharp at f4.5 through f11. On Pentax equipment,the lens does not have Sigma's HSM technology but autofocuses using the older screw-drive technology. I don't know the reason for this but I found the autofocus to be fast and accurate. I believe it's as fast as my Pentax DA lenses. Added bonus: I use the Pentax 1.4 DA teleconverter with this lens making it a 700mm f6.3. All autofocus functions are retained and I see no loss of image quality when using it.

            Share this review

             
            5.0

            Awsome lens

            By Jerry

            from Virginia

            Comments about Sigma 500mm f/4.5 EX DG APO Autofocus Lens for Pentax AF:

            This lens is everything I expected. I'll have a great time shooting birds and wildlife. Also, the service is always top notch from B&H.

            Share this review

            (5 of 5 customers found this review helpful)

             
            5.0

            very nice -- sigma f/4.5

            By oeriies

            from setauket, new york

            About Me Hobbyist/Enthusiast

            Verified Reviewer

            Pros

            • Durable
            • Easy To Use
            • Lightweight
            • Sharp
            • Value

            Cons

              Best Uses

              • Wildlife

              Comments about Sigma 500mm f/4.5 EX DG APO Autofocus Lens for Pentax AF:

              This is a very sharp lens. I have a lot of excellent lenses in my kit, including Pentax DA* and FA limiteds, but this is by far the best piece of glass.

              For birders, this on a Pentax K-5 is arguably the best thing going. It is a pound or two lighter and thousands of dollars less expensive than the Nikon or Canon OEM 500mm lenses. And thanks to Pentax in-body shake reduction and the relatively light weight I can hike a couple of miles with it on a BlackRapids shoulder harness without having to take aspirin that night (I'm an older guy) and fire off hand-held shots with ease and accuracy.

              It is unfortunate that Sigma charges the same for the Pentax version as the Nikon and Canon versions, which have image stabilization and ultrasonic moters, whereas the Pentax model has screw drive and no built-in IS. But the Pentax version works as well and doesn't weigh as much so despite the downgraded features it is a winner. The lens performs very well with a Tamron 1.4x Pz-AF teleconverter, giving a reach on a APS-C sensor of a bit more than a 1000mm equivalent on a full frame camera.

              On the negative side, the lens case is of high quality but basically useless everyday because the lens hood has to be removed and reversed to fit and the strap is cosmetic rather than functional. The lens foot/handle is a couple of inches shorter than desirable for balancing the lens on a monopod/tripod with a camera attached. Finally, the lens will not take a front UV filter so to protect this puppy you need to keep the hood permanently in place.

              But these are quibbles. You won't be sorry if you buy this lens.

              • Was this a gift?:
              • No

              Share this review

              (3 of 3 customers found this review helpful)

               
              5.0

              Wow

              By Birdsrus

              from Australia

              About Me Semi-Professional

              Verified Reviewer

              Pros

              • Durable
              • Easy To Use
              • Reliable

              Cons

                Best Uses

                • Environmental
                • Everyday use
                • Law enforcement
                • Wildlife

                Comments about Sigma 500mm f/4.5 EX DG APO Autofocus Lens for Pentax AF:

                It has taken a long time to take this glass from my wish list to reality. I am still going wow every time I use it. It is much, much better than any long telephoto I have owned. I am stunned by the detail that comes up in dark bird feathers. It is a magic match with the Pentax K5. It has taken my telephoto photography a massive leap forwards.

                I am very satisfied with the screw focusing and focusing speed is faster than i expected. I would think manual focusing would be a breeze.

                I was expecting it to be much heavier and more difficult to hold. It has a solid handle that one can grip with their full hand. As yet i have not bothered putting it on a tripod or monopod. I find I can hand hold and if I can I will rest my arm on something.

                I was expecting a plastic lens shade, however it is solid metal and a thumb screw makes sure it does not slip off.

                I would think that it is no where near weather proof and rain could easily get in. I think the black coating will scuff up quickly.

                I suspect the lens will present 3 problems:
                1. taking it on aircarft with the rest of my kit
                2. where to put in in my car so I can have easy access.
                3. what i will match it with when 500mm is too long.

                I think I am happy to live with these problems.

                • Was this a gift?:
                • No

                Share this review

                (5 of 5 customers found this review helpful)

                 
                5.0

                Serious Telephoto Lens

                By dadipentak

                from Baltimore, MD

                About Me Hobbyist/Enthusiast

                Verified Buyer

                Pros

                • Easy To Use
                • Lightweight

                Cons

                • Expensive

                Best Uses

                • Wildlife Photography

                Comments about Sigma 500mm f/4.5 EX DG APO Autofocus Lens for Pentax AF:

                I'm still in the get-acquainted stage but there's no doubt this is a serious state-of-the-art telephoto. It's useably sharp wide-open and very sharp from f5.6 up. Color rendering and bokeh are very nice. For a 500mm, it's remarkably easy to handle and I love that you can rotate the (included) CPL filter. The only thing it's missing IMHO is a focus limiter.

                • Was this a gift?:
                • No

                Share this review

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