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Ricoh Announces 50mm Prime, First Star Series Lens Share This on LinkedIn   Share This on Google   Tweet This   Forward This

29 June 2018

Ricoh has announced its HD Pentax-D FA⋆50mmF1.4 SDM AW prime lens, a large-aperture single-focus and weather-sealed lens for K-mount dSLR cameras in a new-generation, high-performance Star-series lens.

Pentax said it designed the lens to assure excellent imaging performance with all compatible camera bodies, even when mounted on its next-generation dSLRs which will feature image quality and performance even higher than existing models.

Pentax-original lens coating technologies employed include the latest Aero Bright Coating II for low reflectance and a high-grade HD Coating. A front element SP coating protects it from the elements as does its dustproof, weather-resistant body.


Highlights of the 50mm include:

  • K-Mount lens/full-frame format
  • Aperture range: f1.4 to f16
  • One aspherical element
  • Anomalous dispersion aspherical element
  • Ultrasonic Motor SDM
  • Aero Bright Coating II and HD Coating
  • Front element SP coating
  • Rounded 9-blade diaphragm
  • Weather sealed


Specifications for the 50mm include:

Mount KAF4 K-Mount
Focal Length 50mm (76.5mm 35mm equivalent on Pentax APS-C dSRLs)
Aperture f1.4 to f16
9 rounded diaphragm blades
Angle of View 47.9°
Minimum Focus 1.3 ft.
Optical Design 15 elements in 9 groups
Autofocus Yes
Image Stabilization No
Filter Thread 72mm
Dimensions 3.1 x 4.2 inches
Weight 33.7 oz. with hood


Ricoh said the Pentax 50mm will ship in July for $1,199. Adorama and B&H are both now accepting pre-orders.

Ricoh Announces HD Pentax-D FA⋆50mmF1.4 SDM AW Prime Lens

A large-aperture single-focus lens for use with K-mount dSLR cameras; a new-generation, high-performance Star-series lens accommodating next-generation camera bodies

TOKYO -- Ricoh Company, Ltd and Ricoh Imaging Company, Ltd. are pleased to announce the launch of the HD Pentax-D FA⋆50mmF1.4 SDM AW. This large-aperture, single-focus standard lens is the newest model in the acclaimed Pentax Star ($[!]Star;) series -- the lineup boasting the best imaging performance of all Pentax lenses for use with K-mount dSLR cameras.

For the new lens, Pentax conducted an extensive review of its in-house standards for the top-of-the-line Star series, demanding the maximum compensation of various aberrations in order to deliver the highest image quality. Pentax also designed the lens to assure excellent imaging performance with all compatible camera bodies -- even when mounted on next-generation dSLR cameras which will feature image quality and performance even higher than existing models. The new lens delivers the superb imaging power demanded of a new-generation, high-performance Star-series lens, assuring exceptional resolving power from the center to the edges of the image field, even when set to open aperture. Thanks to Pentax-original lens coating technologies -- including the latest Aero Bright Coating II assuring exceptionally low reflectance and the high-grade HD Coating -- it produces extra-sharp, high-contrast images free of flare and ghost images. Its dustproof, weather-resistant body also makes it extremely dependable and durable for shooting in demanding outdoor conditions.

Main Features

1. New-generation, high-performance Star-series lens with large f1.4 maximum aperture

This lens has been developed as a new-generation member of the high-performance Star series -- a lineup designed to deliver extra-clear, high-contrast images with edge-to-edge sharpness by compensating various aberrations to a minimum. After conducting an extensive review of the Star-series standards, Pentax has designed this lens to assure greatly improved resolving power, looking ahead to its use with more advanced, next-generation camera bodies. It provides exceptionally high imaging performance even at open aperture, in addition to a beautiful bokeh (defocus) effect and an outstanding image rendition at close ranges. Developed as the first model of the new-generation Star-series lenses, this large-aperture standard lens boasts an extra-large f1.4 maximum aperture, useful with many different subjects in a range of applications, including portraiture with an effectively defocused background and handheld shooting of indoor scenes.

2. State-of-the-art optical technology

The lens is treated with Pentax-developed Aero Bright Coating II* -- a lens-coating nanotechnology employing a super-low refractive film fabrication process. By coupling this advanced lens coating with the high-grade, multi-layer HD Coating -- which reduces average reflectance in the visible ray spectrum to less than 50 percent of conventional multi-layer coatings -- this lens effectively reduces flare and ghost images to a minimum even in demanding lighting conditions such as backlighting. By incorporating three super-low dispersion glass elements and one aspherical element in its optics, it effectively compensates chromatic and spherical aberrations and produces brilliant, high-contrast images with edge-to-edge sharpness. Since it minimizes distortion even at a focusing distance of approximately one meter, it produces crisp, distortion-free images over the entire focusing range, from the minimum focusing distance to infinity.

* A state-of-the-art, Pentax-original lens coating technology developed from nanotechnology. It applies a silica aerogel layer with a uniform porous structure over a regular multi-coating layer to reduce surface reflections across a wide wavelength range and produce crisp, high-quality images.

HD stands for High Definition.

  1. Dustproof, weather-resistant construction

Developed as an AW (All Weather) model, this lens features a dependable dustproof, weather-resistant structure with eight special seals to prevent the intrusion of water and dust into the lens interior. When paired with a Pentax weather-resistant dSLR camera body, it forms a durable, reliable digital imaging system that performs superbly in demanding shooting settings -- even in rain or mist or at locations prone to water splashes or spray.

4. Newly developed ring-type SDM

This lens features a newly developed ring-type SDM (Supersonic Direct-drive Motor), which generates as much as 7.5 times the torque of the conventional SDM installed in existing lenses. Thanks to this enormous driving power, the lens assures a smooth, high-speed shift of the heavy, multi-element rear lens group during focusing operation.

5. Other features

  • Nine-blade, round-shaped diaphragm to produce a natural, beautiful bokeh (defocus) effect up to f2.8 aperture setting, while minimizing the streaking effect of point light sources
  • A minimum focusing distance of 40 centimeters, effective in capturing images with a defocus effect
  • Electromagnetic diaphragm-control mechanism,* for flawless, high-precision exposure control during movie recording
  • SP (Super Protect) coating to keep the front surface free of dust and spots

* This mechanism is available when the lens is mounted on a K-1 Mark II, K-1, K-3 II, K-3, KP, K-70, K-50, K-S2 or K-S1 camera body.

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