Pentax SMCP-DA 17-70mm f/4 AL (IF) SDM Autofocus Lens for Digital SLR

Model #21740

USA Version
Pentax 21740 1
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Pentax 21740 7
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Pentax 21740 9
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Dimensions (dxl) Approx. 3.0 x 3.7" (7.62 x 9.40 cm)
Filter thread 67 mm
Weight 1.07 lb (485 g)


Focal length 17 - 70 mm
Comparable APS-C Focal Length: 25.5 - 105 mm
Magnification 0.31x
Aperture Maximum: f/4
Minimum: f/22
Minimum focus distance 11.04" (28.04 cm)
Format compatibility Pentax Digital (APS-C)
Camera mount type Pentax K
Angle of view 79° - 23°
Maximum reproduction ratio 1:3.22
Groups/elements 12/17
Diaphragm blades 7


Image stabilization No
Tripod collar No
Autofocus Yes
Expert Reviews
Digital camera review.32822754
4 September 2008

For several years now, Pentax’s DA 16-45mm f/4 constant-aperture zoom has been one of the workhorse lenses of the manufacturer’s stable. Although newer, faster glass has topped the 16-45mm in Pentax’s lineup, the lens has remained a favorite choice for the budget-friendly performance it offers up.

Pop photo.32824722
10 February 2010

Pentax describes the 17-70mm f/4 lens as a “standard lens with extra zoom,” a cute catch phrase. But “standard zooms,” as they’re called, are one of the most popular lens groups.

User Reviews
B h photo.32817553
2 June 2015

I did purchase this lens in 2010. This image quality is very nice but I did replace the SDM 2 times since. I probably should have purchase the sigma but... I must agree with the fact that pentax should recall all those SDM lens and find a real fix because this is not good for a reputation.Pentax K5...

  • -

    Poor Design

26 August 2015

This lens has a very good build quality. The colors and contrast that this lens gives to a photo are very nice. Yes there is some false color that shows in high contrast area's, but there is a setting in the K3 for controlling it. It is not 100% perfect, but it does work nice.

Product Highlights
  • Zoom Super Wide-Telephoto
Average Expert Score
Average User Score
In The Box
  • Pentax SMCP-DA 17-70mm f/4 AL (IF) SDM Autofocus Lens for Digital SLR
  • 67mm Lens Cap
  • Rear Lens Cap
  • PH-RBM67 Lens Hood for the SMCP-DA 17-70mm f/4 AL (IF) Lens
  • 1-Year Warranty
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