HD Pentax-DA* 11-18mm F2.8 ED DC AW
The HD Pentax-DA* 11-18mm F2.8 ED DC AW lens name carries quite a few acronyms. 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.
"DC" means that the lens uses a direct current, in-lens motor drive for the AF system. DC is faster and more reliable than the older SDM and is much better suited for live view operation. DC also supports continuous video autofocus on compatible bodies.
"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* 11-18mm F2.8 ED EC AW
|Optical Formula|| |
16 elements in 11 groups
|Field of View|| |
Diagonal / Horizontal
APS-C: 104-76 ° / 94-66 °
|Aperture Range||F2.8 - F22|
|Aperture Blades||9, rounded|
|Focus Type||AF, DC motor|
|Minimum Focusing Distance||30 cm|
|Filter Thread Diameter||82mm|
|Hood||Yes, bayonet (petal-shape), PH-RDF82|
|Diameter x Length||90 x 100 mm (3.54 x 3.94 inches)|
|Pentax Mount Designation||KAF3|
|Weather Sealing||Yes (All Weather)|
|Price (US MSRP)||$1296.95|
|Launch Date|| |
This is an APS-C lens that is primarily designed for APS-C cameras. It has limited use on full-frame cameras, which we describe in more detail in our full-frame test of the 11-18mm.