The Pentax K mount Samyang 35mm f/1.4 AS UMC Lens is a prime standard wide-angle lens designed for both full-frame and APS-C sized sensors; when used with an APS-C sensor the 35mm-equivalent focal length is 52.5mm. It is well-suited to working in a variety of situations ranging from landscape to portraiture. Its fast f/1.4 maximum aperture is further beneficial to working in low-light conditions and for greater control over selective focus and shallow depth of field effects.
Two high refractive index elements and one aspherical element have been incorporated into the optical design to minimize chromatic aberrations in order to produce sharper images. A UMC coating has also been applied to lens elements to reduce surface reflections and prevent lens flare and ghosting for improved light transmission and more contrast-rich imagery.