Samyang 35mm f1.4 AS UMC Lens – Pentax K Mount


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The Samyang 35mm f1.4 AS UMC Lens is a fast, manual focus prime lens. The lens’ focal length is suited to a variety of subjects such as landscape, journalism and portraiture, and its fast f1.4 maximum aperture makes it an ideal tool for shooting in low-light conditions too. This lens delivers exceptional resolution and sharpness with ultra-smooth out of focus backgrounds and beautiful bokeh.

Features of the Samyang 35mm f1.4 AS UMC Lens

  • Glass aspherical lens(ASP), High refractive lens(HR)
  • Ultra Multi Coating(UMC) of Samyang Optics
  • Circular aperture with 8 blades
  • Bright F1.4 aperture

Newly released Canon AE version 
Camera controls the aperture when the lens is mounted with Canon AE.

Glass aspherical lens (ASP) 
It minimises color aberration to realize exceptional image quality and high contrast for center and corner of image even when aperture is fully opened.

High refractive lens (HR) 
High quality refractive lens gives you brighter image.

Ultra Multi Coating (UMC) of Samyang Optics 
Ultra Multi Coating of Samyang Optics is used to minimize flare and ghost and realise crisp color image.

Circular aperture with 8 blades 
8 aperture blades create almost a full circle when closed and express ray beautifully as starlight.

The optical design of the Samyang 35 mm F1.4 UMC lens is 12 elements arranged in 10 groups and includes 2 high refractive lens(HR). The inclusion of an glass aspherical lens(ASP) minimizes color aberration, and Ultra Multi Coating(UMC) provides high contrast and trustworthy color reproduction. It is designed according to floating system to preserve high image quality and resolution within close focusing distance.

An aperture control motor and CPU chip is installed within 35mm F1.4 AS UMC Canon AE lens to assist Auto Exposure(AE) for Canon cameras. The aperture can be controlled from camera body thanks to the motor and chip. Also the appropriate focus is guided with indicator light.

This lens is supplied with front and rear lens caps, petal-type lens hood (which is reversible for transporting) and a soft lens pouch. Filter size is 77mm.

Specifications of the Samyang 35mm f1.4 AS UMC Lens

Aperture Blades 8
Colour Black
Filter Thread Size (mm) 77
Focal Length – Tele (mm) 35
Focal Length – Wide (mm) 35
Focal Mechanism Manual
Lens Mount Pentax K
Lens Type Prime
Maximum Aperture – Tele 1.4
Maximum Aperture – Wide 1.4
Minimum Aperture 22
Number of Lens Elements 12
Number of Lens Groups 10
Sensor Format Full Frame
Size (mm) 111.5 x 83mm
Weight (g) 710
Angle of view (degrees) Full Frame: 63.1 degrees / APS-C: 40.8 degrees
Minimum Focus Distance (m) 0.3

For a more detailed specification see here. For more Samyang lenses see here.

Additional information

Weight 710 g
Dimensions 111 × 83 mm

Lens Mount

Filter Thread Size (mm)


Lens Type

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