Pentax DA 15mm Limited lens

Last updated
Pentax smc DA 15mm F4 ED AL Limited
PentaxWideAngleLensDA15Limited1.jpg
MakerPentax
Lens mount(s) Pentax K
Technical data
Type Prime
Focus drive Screwdrive
Focal length15mm
Focal length (35mm equiv.)23mm
Aperture (max/min)f/4.0
Close focus distance0.18 metres (0.59 ft)
Max. magnification0.15
Diaphragm blades7
Construction8 elements in 6 groups
Features
Manual focus override Yes check.svg Yes
Weather-sealing X mark.svg No
Lens-based stabilization X mark.svg No
Aperture ringX mark.svg No
Physical
Max. length40 millimetres (1.6 in)
Diameter63 millimetres (2.5 in)
Weight212 grams (0.467 lb)
Filter diameter49mm
Accessories
Lens hoodbuilt in
History
Introduction2009

The Pentax smc DA 15mm F4 ED AL Limited is a wide-angle prime lens for Pentax K-mount, announced by Pentax on March 2, 2009. Along with Pentax's other DA Limited primes, it was replaced in 2013 with an HD-coated version with rounded aperture blades. [1]

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Pentax lenses were first badged as Takumar. The Takumar branded lenses were well respected for their line of Super Takumar, which designated the high performance coating applied to the lens as well as the optical formulas used to make them. The majority of the industry at the time was still satisfied with the variations of the "plumb" coating process and later some of the two and three layer processes as well. Asahi Pentax soon introduced the Takumar Super-Multi-Coated line of lenses which was a 7 layer process as the industry had just caught up with similar forms of 5 layer multi-coated optics. Eventually Asahi Optical and Pentax slowly shifted much of their lens production under the Pentax name and transitioned some of the successful designs that were first introduced under the Takumar name to use Asahi/Pentax badging as well as beginning to use the "smc" abbreviation. Eventually the Asahi partnership disappeared and the Pentax name became solely used. Pentax lenses saw many feature changes to answer the market, such as: incorporating "Auto-Aperture" with the M42, the light weight and compactness with the 'M' series, Aperture Priority overrides with the 'A' series, and Auto-Focus with the 'F' series. Modern Pentax lenses for digital SLR cameras have seen the elimination of the aperture ring completely as found on Pentax DA and D-FA series lenses. They use the Pentax KAF mount. All of these lenses have an autofocus feature, either operated from the camera body or from an internal SDM motor. Pentax compatible lenses are also made by third-party companies.

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References

  1. "Pentax smc DA 15mm F4 ED AL Limited: Digital Photography Review". www.dpreview.com. Retrieved 2023-06-24.