Samyang 20mm F1.8 is a Manual Focus (MF)
Wideangle Prime lens with 35mm FF max sensor coverage and it is designed to be used with Pentax KAF mount cameras.
Lenses in Pentax KAF Mount with Same Focal and Aperture Range
Lens Mount
Samyang 20mm F1.8 is compatible with cameras that have
Pentax KAF lens mount. Some of the latest released cameras with Pentax KAF lens mount are
Pentax K-3 III,
Pentax K-1 II and
Pentax KP.
Sensor Coverage
Max sensor coverage of Samyang 20mm F1.8 is
35mm FF.
Focal Range
Samyang 20mm F1.8 has a fixed focal lenght of 20mm. When it is mounted on an APS-C sensor camera with 1.5x crop, it provides an 35mm (FF) equivalent of 30mm.
Aperture
Samyang 20mm F1.8 has a max aperture of F1.8 and a minimum aperture of F22.
Optical Formula
Samyang 20mm F1.8's optical formula consists of 13 elements in 12 groups. Following special elements are used in this design:
- Two aspherical
- 3 ED elements
- Ultra Multi Coating