Sigma 50-500mm F/4.5-6.3 APO DG OS HSM Lens for Pentax

Model #738109

USA Version
Sigma 738109 1
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Lensessigma 738109 10
Sigma 738109 2
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Weight 4.33 lb (1.96 kg)
Dimensions (dxl) Approx. 4.1 x 8.6" (10.41 x 21.84 cm)
Filter thread 95 mm


Aperture Maximum: f/4.5 - 6.3
Minimum: f/22
Maximum reproduction ratio 1:3.1
Camera mount type Pentax K
Angle of view 46.8° - 5.0°
Minimum focus distance 1.64' (49.99 cm)
Focal length 50 - 500 mm
Comparable APS-C Focal Length: 75 - 750 mm
Groups/elements 6/22
Magnification 0.32x
Diaphragm blades 9
Format compatibility Pentax Digital (APS-C)


Tripod collar Yes
Autofocus Yes
Image stabilization Yes
Expert Reviews
Pentaxforums com.33034396
26 August 2011

The Sigma 50-500mm APO DG OS HSM F4.5-6.3 is Sigma's latest version of their 50-500mm superzoom lens, commonly known as the "Bigma". Introduced in February, 2010, it replaces the old 50-500mm F4-6.3 EX DG HSM and features a slightly modified optical formula, losing half a stop at the wide end in...

Pop photo.32824722
13 July 2010

The first version of this lens earned the nickname Bigma for its 4.25-pound heft and huge size.Now comes Son of Bigma ($1,600, street), lighter at a little less than 4.2 pounds, yet with a number of optical improvements including image stabilization.Like the original, this 50–500mm boasts the...

User Reviews
10 December 2013

If your thing is wildlife and you want to lug only one lens you may consider the Bigma as it's versatility can not be beat. At 200mm its useful for those quick shots of dragonflies and butterflies.

  • +


  • -

    Poor in Low Light, Slow Focus

28 September 2014

I have not been happy with the auto focus. I have used this lens with both a cannon T3 and a cannon 70D. The problem is it will no come into focus. I have contacted sigma asking if there is anything that can be done about this. I have not yet gotten a reply.

Photography review.32822891
27 April 2010

I'm currently in my second two week rental of this lens. Note that is second rental, not second week of the first rental. I think from the fact that I opted to rent it again, you may be able to guess that I rather like it.

  • +

    Sharp at all focal lengths., Stunningly good bokeh, Good AF., Outstanding OS., Killer Range., 500mm handheld!, Lightweight (relatively speaking), Price

  • -

    Only f/6.3 at the longest focal length, Still somewhat heavy when compared to say, the 300mm f/4. That said, you get a lot more reach with the Bigma OS., Some minor chromatic aberration, especially in high contrast situations, AF has trouble with cluttered shots (brush in front of the subject).

Product Highlights
  • 10x High Zoom, Ultra Telephoto Lens
  • For Pentax DSLR Cameras
  • Compatible With APS-C Sensor Cameras
  • Optical Stabilization for Sharp Photos
  • Quiet & High-Speed Auto Focus
  • SLD Glass for Optimum Color Correction
Average Expert Score
Average User Score
In The Box
  • Sigma 50-500mm F/4.5-6.3 APO DG OS HSM Lens for Pentax
  • Front and Rear Lens Caps
  • Tripod Collar
  • Case
  • 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.
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