Pentax SMC Pentax DA 50-200mm f/4-5.6 ED WR Zoom Lens

Model #21870

USA Version
Pentax 21870 1
Pentax 21870 1
Pentax 21870 2
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Dimensions (dxl) Approx. 2.7 x 3.1" (6.86 x 7.87 cm)
Filter thread 49 mm
Weight 10.1 oz (286 g)


Magnification 0.24x
Groups/elements 10/11
Angle of view 31.5° - 8.1°
Diaphragm blades 6
Aperture Maximum: f/4.5 - 5.6
Minimum: f/22 - 32
Format compatibility Pentax Digital (APS-C)
Maximum reproduction ratio 1:4.16
Camera mount type Pentax K
Minimum focus distance 3.60' (1.10 m)
Focal length 50 - 200 mm
Comparable APS-C Focal Length: 76.5 - 307 mm


Tripod collar No
Image stabilization No
Autofocus Yes
User Reviews
B h photo.32817553
20 July 2015

This lens works very nicely when shooting wildlife with a Pentax K-50. I am amazed how well very tightly cropped photos hold up with this combination. Autofocus is sometimes an issue in some situations for me, but I am able to switch easily to manual focus to get the shot.I normally shoot RAW+jpeg.

12 November 2016

Was my first purchase for the K-5. Poor lens. Avoid! Avoid! Avoid! May be cheap but it's a false economy, as most of your shots will go in the bin. While contrast is ok, and CA and flare is not excessive, getting something sharp with this lens is rare to impossible, even stopped down.

  • +

    WR, price, size, useful focal range

  • -

    not fast, not sharp, poor bokeh

29 June 2014

Buyers, please be aware, as per another review, 'Another Deal Site' are providing cheap kit versions of this lens and not as advertised. Where the advertised lens retails for $250, the other lens only retails at $100 (Though is only meant to come with a kit).

B h photo.32817553
9 November 2016

Solid lens, as usual, I didn't expect anything less from Pentax. It has a good zoom range and it feels solid in my hands. WR is a definite plus, as the lens is best used outdoors.

B h photo.32817553
16 August 2016

This fits my needs of taking amateur photos of wildlife. I bought it for a safari, so I practiced at the zoo in the daytime. The auto works just as good as manual, with or without flash on a near subject with an animal in the background, or a closeup of an animal such as an elephant.

2 April 2016

I read some reviews about how bad this lens is but I decided to give it a shot anyway. I think I lucked out and got a good copy because I am very pleased with this lens. The only issue is the auto focus hunting a little. I would not discourage anyone from buying the lens on that issue though.

  • +

    Sharp. great walk around lens

  • -


18 December 2015

Wide open, it's really soft, and requires f:8 or higher to obtain clean shots, but f:11 produces cleaner shots, though this means that you need to push the ISO higher than desired which can produce noisy images.

  • +

    Lightweight, WR, Focal Length

  • -

    Softness, Slight CA

B h photo.32817553
16 December 2015

Solidly built long zoom lens, with a metal mount, smooth, but firm zooming, and focus shift. I hike a lot, being weather resistant is a plus.

3 October 2015

I bought this to use when travelling as the 55-300mm is just too big and heavy. I also wanted a longer weather resistant lens.

  • +

    Small, light-weight

  • -

    not very sharp

18 May 2015

Wasn't really expecting much of the lens but I was pleasantly surprised. I did not have any WR lens nor did I have anything in this focal range, so I thought... 2 birds.

  • +

    Light weight, WR, fast to focus in good light, price

  • -

    Not so sharp

Product Highlights
  • For Use in Pentax Digital SLR Cameras With KAF-mounts.
In The Box
  • Pentax SMC Pentax DA 50-200mm f/4-5.6 ED WR Zoom Lens
  • Lens Hood (PH-RBD49)
  • 49mm Front Lens Cap (31526)
  • Rear Lens Cap B
  • 1-Year Manufacturers Warranty
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