HD Pentax-DA* 16-50mm F2.8 ED PLM AW


The HD Pentax-DA* 16-50mm F2.8 ED PLM AW lens name certainly is a mouthful.  To distingiush it from its predecessor, look for the "HD" or "PLM" designations. Below is an explanation of various terms pertinent to this lens:


"HD" is the name of the current most advanced coatings available for Pentax lenses. Building on the famous SMC coatings, it improves contrast and flare management.


"DA" refers to a lens designed for APS-C cameras.  The lens carries information used for specific program lines, in-camera lens corrections, and so forth.


"F" is the maximum aperture of the lens, 2.8 in this case.


"ED" means that the lens uses extra low dispersion elements to improve optical performances.


"PLM" means Pulse Linear Motor. It is the most recent AF engine from the company, and is near-silent and substantially faster than the older screw-drive design.


"AW" means the the lens is weather resistant and can be used in "all weather". It cannot be submerged but will resist splashes, rain, snow, dust and other adverse conditions. AW is superior to WR; since this lens both zooms and focuses internally, a high degree of water resistance is expected.


"SP" is not part of the lens name, but still an important part of its characteristics. Super Protect is a type of coating used by Pentax that helps repel dust and grease on the front element, making the lens easier to clean.

Below are the lens specifications.

Lens Name

HD Pentax-DA* 16-50mm F2.8 ED PLM AW

Optical Formula

16 elements in 10 groups (three super ED glass lens elements, one anomalous glass element)

Image Circle APS-C
Auto-Exposure Support Yes (no aperture ring)
Construction Metal
Field of View

Diagonal / Horizontal

APS-C: 84-32 ° / 74-27 °

Aperture Range F2.8 - F22
Aperture Blades 9 (rounded)
Aperture Ring No
Max. Magnification 0.24x
Focus Type AF, PLM, quick-shift (focus by wire)
Minimum Focusing Distance 30 cm
Internal Focus  No
Filter Thread Diameter 77mm
Cap Yes, clip-on
Hood Yes, bayonet (petal-shaped) PH-RBM77
Case Included soft pouch S120-150
Diameter x Length 84 x 117 mm (3.3 x 4.6 inches)
Weight 712 g
Pentax Mount Designation KAF4
Weather Sealing Yes
Price (US MSRP)


Launch Date

July 2021

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