HD Pentax-D FA 24-70mm F2.8 ED SDM WR

Specifications

The HD PENTAX-D FA 24-70mm F2.8 ED SDM WR bears numerous acronyms. They are explained here.

HD

"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.

D FA

"D FA" refers to a lens designed for full frame digital cameras.  The lens carries information used for specific program lines, in-camera lens corrections, and so forth. It is also fully usable with APS-C sensors.

F

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

ED

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

SDM

"SDM" means Supersonic Direct-drive motorAs per RICOH the SDM autofocus motor in the 24-70mm is of a new generation.

WR

"WR" means the the lens is weather resistant. It cannot be submerged but will resist splashes, rain, snow, dust and other adverse conditions.

SP

"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.

The table below summarizes the specifications.

Lens Name

HD PENTAX-D FA 24-70mm F2.8 ED SDM WR

Optical Formula

17 elements, 12 groups (One anomalous-dispersion-glass aspherical element, three aspherical elements and three ED elements)

Image Circle Covers the 24x36mm format (full frame)
Auto-Exposure Support Yes
Construction Plastic
Field of View

Diagonal / Horizontal

APS-C: 61 to 23 ° / 53 to 19.5 °
Full frame: 84 to 34.5 ° / 74 to 29 °

Aperture Range F2.8 - F22
Aperture Blades 9 rounded
Aperture Ring No
Max. Magnification 0.2X
Focus Type AF, SDM, quick-shift
Minimum Focusing Distance 38 cm
Internal Focus  Yes
Filter Thread Diameter 82mm
Cap Yes, clip-on
Hood Yes, bayonet (petal-shaped), PH-RBD82
Case Yes, S120-150
Diameter x Length 88.5 x 109.5 mm (3.5 x 4.3 in.)
Weight 787 g (27.8 oz.)
Pentax Mount Designation KAF3
Weather Sealing Yes (WR)
Price (US MSRP) $1296.95 (November 2016)
Launch Date 2015
Country of Origin Japan
Other features Zoom lock

The lens is essentially a rebadged Tamron lens (based on the SP 24-70mm F2.8 Di VC USD). The differences are the removal of the image stabilization mechanism, the addition of WR and Pentax HD and SP coatings, as well as a different external finish.


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