Pentax DA Star 16-50mm f/2.8 Lens

Weather-resistant, high-performance "standard" zoom lens for Pentax K-mount digital SLRs

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Item #: 815DA1650

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Built for the road

Everyone needs a lens like this in their kit — one that can weather the elements and get you crisp images wherever your subject takes you. The Pentax DA 16-50mm f/2.8 ED/AL is the one lens you'll need when you're not sure what's next — a dramatic landscape, a child's face out on the playground — or a drenching rainstorm. With weather-resistant, dust-resistant construction, this lens is the perfect companion to the Pentax K-5 weather-resistant digital SLR. Between the two, you'll have a combo that's built for bringing home the elusive shot under challenging circumstances.

Plus, this lens isn't just rugged — it's got optical talents as well. A fixed aperture of f/2.8 means it's ready for low-light opportunities. Extra-low dispersion and aspherical glass elements, plus special Pentax coatings, make your images as sharp and artifact-free as they can be. And the supersonic-motor autofocus is quiet, responsive, and accurate.

Product Highlights:

  • Pentax DA Star KAF2 16-50mm f/2.8 ED/AL standard zoom lens with 35mm equivalent of 24.5-76.5mm
  • compatible with Pentax K-mount digital SLR and hybrid cameras, especially the weather-resistant Pentax K-5
  • ED (extra-low dispersion) and aspherical glass lens elements correct chromatic aberration for excellent image quality and sharpness
  • tightly sealed, weather-resistant and dust-resistant construction enhances durability for use in both rainy and dusty conditions
  • SDM supersonic-motor autofocus system is smooth, quiet and fast
  • constructed of 15 elements in 12 groups
  • minimum focus distance: 11-15/16"
  • minimum aperture: f22
  • filter size: 77mm
  • lens is 3-15/16" long, 3-5/16" in diameter
  • weight: 19.9 ounces
  • supplied accessories: front and rear lens caps, lens hood, soft case
  • warranty: 1 year
  • Our 60-day money-back guarantee

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Hands-on research

What's in the box?

Download owner's manual

  • smc Pentax-DA Star 16-50mm f/2.8ED AL [IF] SDM lens (with attached front and rear lens caps)
  • PH-RBJ 77mm lens hood (installed on lens)
  • Operating Manual
  • Notification of Change of Company Name sheet
  • Pentax Worldwide Service Network sheet
  • Serial Number Card

Features and Specs

Brand Compatibility Pentax
Image Stabilization No
Focal Length 16-50mm
Maximum Aperture F2.8
Weight 19.9 ounces
Parts Warranty 1 Year
Labor Warranty 1 Year

Product Research


Overview: The high-performance smc Pentax-DA Star 16-50mm F2.8ED AL [IF] SDM lens is for wide angle to medium applications.

Weather Resistant: The tightly sealed, weather-resistant and dust-resistant construction enhances durability for use in both rainy and dusty conditions.

Lens Mount: The lens has a KAF2-mount, and can fit Pentax D-SLR and interchangeable lens cameras with KAF, KAF2 and KAF3 mounts. This includes the Pentax K-5 and K-01 cameras.

SDM Focus System: The lens is equipped with a supersonic motor for achieving smooth and quiet autofocusing. It has a focus mode switch on the barrel for changing from autofocus to manual focus. The switch allows you to leave the camera in the autofocus mode, and change modes on the lens.

ED Glass: The lens has two Extra-low Dispersion (ED) glass lens elements and three aspherical elements to compensate for chromatic aberrations. The aspherical elements, ED glass, and original lens coatings offer superior contrast, clarity, and edge-to-edge sharpness.

Super Protect: The Pentax-original SP (Super Protect) coating repels dust, water, and grease to help keep the lens clean.

Lens Hood: The lens comes with the PH-RBK 67mm lens hood for keeping unwanted light from entering the lens, and for protecting the front of the lens. It has a PL filter window which can be opened for facilitate the manipulation of the circular polarizing filter when the lens hood is attached. The hood can be reverse-mounted on the lens for storage. When installed, the hood adds approximately 3-5/16" to the overall length of the lens.


  • Focal Length: 16-50mm
  • 35mm Equivalent: 24.5-76.5mm
  • Lens Construction: 15 elements in 12 groups
  • Mount Type: KAF2-mount
  • Maximum Aperture: F2.8
  • Minimum Aperture: F22
  • Maximum Magnification: 0.21x
  • Angle of View: 83°-31.5°
  • Minimum Focus Distance: 0.98' (11.76")
  • Lens Hood: PH-RBJ 77mm (included)
  • Filter Diameter: 77mm
  • Dimensions:
    • Diameter: 3.302"
    • Length: 4.3" (4.748" w/caps)
    • Weight: 19.9 ounces (21.2 oz. w/lens hood)

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