Pentax SMC DA 18-135mm F/3.5-5.6 ED AL (IF) DC WR Lens

Model #21977

USA Version
Pentax 21977 1
Pentax 21977 1
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Filter thread 62 mm
Weight 14.3 oz (405 g)
Dimensions (dxl) Approx. 2.9 x 3.0" (7.37 x 7.62 cm)


Aperture Maximum: f/3.5 - 5.6
Minimum: f/22 - 38
Focal length 18 - 135 mm
Comparable APS-C Focal Length: 27.5 - 207 mm
Camera mount type Pentax K
Angle of view 76° - 11.9°
Maximum reproduction ratio 1:4.16
Format compatibility Pentax Digital (APS-C)
Minimum focus distance 1.3' (40 cm)
Diaphragm blades 7
Groups/elements 11/13
Magnification 0.24x


Image stabilization No
Tripod collar No
Autofocus Yes
Expert Reviews
What digital camera.32818507
31 August 2011

Overall, this is a capable, compact and comfortable-to-use lens that has the capability to overcome a range of different challenges, both photographic and meteorological.

  • +

    Fuss-free operation

  • -

    Distortion at extreme focal lengths

Pentaxforums com.33034396
21 August 2014

Since the DA 18-135mm lens it arrived in the hands of Pentaxians, the 7.5x all-in-one zoom has amassed quite the following. As of the publication of this review, there are 82 user reviews that amount to an average rating of 8.52 out of 10.

  • +

    Weather Sealed and overall excellent build quality, Excellent kit lens for beginners as well as "foul weather standard zoom" for advanced users, Highly accurate, fast, and silent DC autofocus, Maintains faster aperture across entire range as compared to similarly sized 18-55mm kit lens, Great...

  • -

    Corners are terribly soft and lacking in contrast, especially at wider angles due to high distortion, Distortion at wider angles can be problematic, particularly indoors, Narrow focus ring and focus ring placement makes manual focusing cumbersome, Lack of focus distance scale, Vignetting is very...

Pop photo.32824722
5 July 2011

With the widest zoom range of any current Pentax lens (7.5X), the new 18–135mm f/3.5–5.6 ($500, street) is the closest it has today to an all-in-one zoom. A 27–202.5mm full-frame equivalent, this is also one of the few lenses in its class with a weather-resistant (WR) O-ring on the lensmount.

26 January 2009

Weather resistant, compact, sporting the new DC motor and all in a very compact package, this new Pentax lens is very appealing. Braving the English rain, we shall see if its performance lives up to its potential.

User Reviews
B h photo.32817553
29 November 2014

I purchased the SMC DA 18-135mm F/3.5-5.6 ED AL (IF) DC WR Lens by Pentax when I bought a K5 body when they first came out it was my first and only lens for a long period of time I definitely made the right decision the photos have been fantastic, it is quick to focus on any subject matter and all...

  • +

    Awesome For Price, Compact Design, Easy To Use, Improves Picture Quality

  • -

    None That I Can Find

16 May 2015

Nice single lens that covers wide to telephoto. Perfect lens when you are on the go and don't want to carry extra lenses or change lenses. Mine came with the Pentax hood and caps. Excellent deal!

29 March 2013

very good lens not the sharpest lens in the bag, but that is the only knock against it. Very good general lens weather resistant with an amazing build quality puts all but expensive lenses to shame..

  • +

    Consistent Output, Durable, Easily Interchangeable, Fast / accurate auto-focus, Nice Bokeh

Product Highlights
  • Extended 7x 18-135mm Zoom Range
  • 35mm Equivalent: 27.5-207mm
  • Weather Resistant
  • Compact, Lightweight Design
  • Quick, Quiet Autofocus Operation
  • SP Coating Repels Dust, Water, & Grease
  • Fast Switching From Auto to Manual Focus
  • Aspherical Lens Elements
  • Designed for Pentax Digital SLR Cameras
Average Expert Score
Average User Score
In The Box
  • Pentax SMC DA 18-135mm F/3.5-5.6 ED AL (IF) DC WR Lens
  • Front and Rear Lens Caps
  • Lens Hood
  • 1-Year Limited Warranty
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