Pentax K-1 Mark II + D FA STAR 50/1.4 Reflex Camera

A new-generation, high-performance Star-series lens delivering superb imaging power and exceptional resolving power. This large-aperture, single-focus standard lens is the newest model in the acclaimed PENTAX Star (★) series — the lineup boasting the best imaging performance of all PENTAX lenses for use with K-mount digital SLR cameras. The 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.

USAGE NOTE:
- This lens features a KAF4 lens mount compatible with an electromagnetic diaphragm control system. Cameras compatible with this system are K-1 Mark II, K-1, K-3 II, KP, K-70, K-3, K-S2, K-S1 and K-50. For K-1, K-3 II, K-3, K-S2, K-S1 and K-50, the camera’s firmware must be upgraded to the latest version. If this lens is mounted on a camera without proper firmware upgrade, its diaphragm control mechanism becomes inactive, making it impossible to obtain correct exposure.

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.

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% 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.

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 digital SLR 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.

Newly developed ring-type ultrasonic wave motor 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.

Ring-type ultrasonic wave motor SDM

Others:
- 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, KP, K-70, K-3, K-S2 or K-S1, K-50 camera body.


Specifications:

- Focal Length: 50mm
- Equivalent to 76.5mm in 35mm format (when attached to PENTAX APS-C size DSLR cameras)
- Maximum Aperture: F1.4
- Minimum Aperture: F16
- Lens Construction: 15 elements in 9 groups

Angle of View (Diagonal):
- 47.0°
- 31.5°(when attached to PENTAX APS-C size DSLR cameras)

- Mount: KAF4
- Minimum Focusing Distance: 0.4m (1.3ft.)
- Maximum Magnification: 0.18x
- Filter Diameter: 72mm

Diaphragm Control:
- Electromagnetic diaphragm
- Fully automatic

- Number of Diaphragm Blades: 9
- Rounded diaphragm （50mm:F1.4-F2.8）
- Aperture: Ring: N/A
- Tripod Mount: N/A
- Lens Hood: PH-RBB72 (included)
- Lens Cap: O-LC72 (included)
- Lens Case: S100-140 (included)
- Maximum Diameter x Length: approx. 80mm x 106mm (approx. 3.1in. x 4.2in.)

Weight:
- approx. 910g / with hood approx. 955g (approx. 32.1 oz./ with hood approx. 33.7oz.)

- Temperature: -10°C～40°C (14°F～104°F)
- Humidity: 85% or less (no condensation)

Included Accessories:
- Lens Hood PH-RBB72, Lens Cap O-LC72,
- Lens Mount Cap K,Lens Case S100-140

Others:
- HD Coating
- Aero Bright Coating II
- SP (Super Protect) Coating
- AW (All Weather Resistant)
- Quick-shift Focus System (QFS/M)
- SDM (Ultrasonic Motor)

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