The HD PENTAX-D FA★50mm F1.4 SDM AW lens delivers exceptional resolving power from the center to the edges of the image field, even when set to open aperture. It incorporates state-of-the-art PENTAX-developed lens coating technologies — including the new Aero Bright Coating II for exceptionally low reflectance and high-grade high-definition (HD) Coating — that enable it to 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. Its PENTAX K-mount covers the image circle of a 35mm-format full-frame image sensor. This large-aperture, prime lens delivers stellar imaging performance and maximum light transmission—the hallmarks of the acclaimed Star series line—and is the perfect companion to any K-mount digital SLR camera.

This lens features a KAF4 lens mount compatible with an electromagnetic diaphragm control system. Camera’s 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.


Lens Mount PENTAX KAF4 mount
Focal Length 50mm
Equivalent to 76.5mm in 35mm format

(when attached to PENTAX APS-C size DSLR cameras)

Angle of View 47°
Lens Construction(group/elements) 15 elements in 9 groups
Diaphragm control Electromagnetic diaphragm

Fully Automatic

Number of aperture blades 9

Rounded Diaphragm (50mm:F1.4-F2.8)

Min. Aperture (f) F16
Min. Focusing Distance 0.4m (1.3 ft.)
Max. Magnification 0.18x
Filter Size 72mm
Diameter & Length (mm) approx. 80mm x 106mm
Weight (g) approx. 910g / with hood approx. 955g
Notes Aero Bright Coating II

HD Coating
AW (All Weather)
SDM (Supersonic Direct-Drive Motor)
Quick-shift Focus System

SP coating

Model No. 21260