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September 17, 2012

Pentax Lenses HD Coating Technology for Pentax K-Mount cameras


Pentax recently introduced its newly developed HD Coating technology – a multi-layer lens coating process – for all new HD (High Definition)  Pentax lenses for Pentax K-Mount cameras.

Compared with conventional multi-layer coatings, the new multi-layer HD Coating,* exclusively developed by  Pentax, offers much improved light transmittance and a much lower refractive index. Because this advanced coating minimizes reflections, the lens delivers sharp, clear images free of flare and ghosting, even under demanding lighting conditions such as backlight. This coating assures optical performance almost equal to Aero Bright Coating, another  Pentax-exclusive lens coating process made possible by advanced nanotechnology and applied to higher-class lenses.

Also introduced last week by Pentax is the new K-Mount HD  Pentax DA 560mm F5.6 ED AW interchangeable super-telephoto lens and the new HD  Pentax D FA 645 Macro 90mm F2.8 ED AW SR interchangeable lens for the medium format 645D – the first lenses to feature this exclusive  Pentax HD Coating. All future interchangeable lenses for Pentax digital cameras that feature this new coating will bear the “HD PENTAX” name.

Pentax' HD Coating technology Features include:

- 50 percent reduction of reflections in visible spectrum
The coating reduces reflections by more than 50 percent over the entire visible spectrum, compared to conventional multi-layer coating. 

- High rigidity coating layer
Since the HD Coating has a stronger bond among its coating materials and a higher packing density, this coating layer ensures exceptional high rigidity for extra durability.

- Accurate reflection of design concept to actual coating layer
In conventional multi-layer processes, the coating layer is produced by the vacuum evaporation method, in which coating materials are dissolved and deposited in a vacuum. This method, however, sometimes causes coating unevenness great enough to affect image quality. 

The HD Coating* effectively solves this problem by employing a Pentax-exclusive manufacturing process, while optimizing the density of its coating layer and controlling the thickness with the accuracy of one nanometer (one millionth of a millimeter). As the result, the original design parameters for the lens coating are accurately applied to the coating layer to optimize anti-reflection performance of a lens.

* HD stands for High Definition, and signifies the lens’s capacity to reproduce images that excel in transparency, definition, resolution and rendition.

Comparison between conventional multi-layer coatings and HD Coating:


The coating reduces reflections by more than 50% over the entire visible spectrum, compared to conventional multi-layer coating. The new coating allows an ideal control of color balance thanks to stable Reflection at Wavelength.

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