HD PENTAX-DA18-50mm F4-5.6 DC WR RE

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The world’s shortest standard zoom lens

This standard zoom lens offers a zoom ratio of approximately 2.8 times to cover the wide-angle to standard ranges (for focal lengths equivalent to 27.5mm to 76.5mm in the 35mm format), which are the most frequently used ranges in general photographic applications. Thanks to its new retractable mechanism, it measures a mere 41 millimeters in length in the stored position — the world’s shortest for a standard zoom lens — to assure outstanding portability in combination with today’s downsized digital SLR camera body.

Dependable weather-resistant construction

This lens features a dependable weather-resistant construction with nine special seals to effectively prevent the intrusion of water into the interior. By pairing it with a weather-resistant PENTAX digital SLR camera body, the user is assured of a durable, reliable digital imaging system that performs superbly in demanding shooting settings — even in the rain or mist, or at locations prone to water splashes or spray.

Exceptional image rendition to accommodate latest digital SLR cameras

Incorporating super-low dispersion glass elements and aspherical elements in its 11-element/eight-group optics, this lens effectively compensates various aberrations for high-contrast, high-resolution, fine-detailed images with minimal color bleeding.

HD Coating to improve image description

This lens is treated with the high-grade, multi-layer HD Coating.* Compared with conventional multi-layer coatings, this PENTAX-original coating assures less reflection and higher light transmittance to deliver bright, high-contrast images free of flare and ghost images, even under demanding lighting conditions such as backlight.

* HD stands for High Definition

Quick-Shift Focus System

This lens is equipped with the PENTAX-developed Quick-Shift Focus System, which allows the user to instantly switch to manual-focus operation, even when the camera’s AF system is in operation.

Other features

• SP (Super Protect) Coating applied to the front surface of the lens to effectively repel water and grease
• Smooth, quiet autofocus operation, driven by the built-in DC motor
• Rounded diaphragm to produce a smooth, beautiful bokeh (defocused) effect, while minimizing the streaking effect of point light sources
• Low-profile lens hood (included),designed for easy carrying without the need to remove it from the lens for

Note: Designs and specifications are subject to change without notice

MTF Chart



MTF Chart



Spatial Frequencies



10 lines/mm 

30 lines/mm

In order to discover the products which are being developped and the ones which are planned, you can download our roadmap in pdf:

To see our K-mount currently available range, please download Lenses & Accessories brochure.

Visit the PENTAX Lens Technology web page to discover more about the PENTAX lens construction.

Read more about the PENTAX Focus Function here.

You can use the PENTAX Lens Glossary to learn more about its features.

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Product Specifications

Article Number21357
Focal length equivalent to 35 mm format27.5-76.5mm
Maximum apertureF4-5.6
Minimum apertureF22-32
Number of Diaphragm Blades


Rounded aperture (18mm: F4-5.6 / 50mm: F5.6-8)

Diaphragm Control: Fully automatic

Angle of View76-31.5°
Construction11 elements in 8 groups
Focusing Range0.3m
Smallest object distance/magnification0.3m
Filter size58mm
WeightApprox. 158g (with hood Approx. 165g)
Dimensions (Length x Diameter)Approx. 41mmx71mm
Special Features

HD Coating • SP (Super Protect) Coating • Weather Resistant
DC motor • Quick-shift Focus System

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