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 motor. As 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 ° |
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.