Samyang 20mm F/1.8 ED AS UMC

Specifications01

MountPENTAX K

Focal length20mm

Max aperturef/1.8

TypeWide · Prime

Weight497 g

Physical length88 mm

Min focus distance20 m

Summary02

Samyang 20mm F/1.8 ED AS UMC is a wide-angle prime for Pentax K-mount cameras, used for landscapes, street, and low-light shooting. It has a maximum aperture of f/1.8 for shallow depth of field and dim conditions.

AI-assisted summary — verify against linked sources

Specifications from dpreview

Where can this lens be adapted?

The Pentax K mount has a flange distance of 45.46 mm. A plain adapter fits a camera whose flange distance is at least 1.46 mm shorter. How lens adapters work

Pentax DA and FA J lenses have no aperture ring. Use an adapter with its own aperture control.
Pentax DA lenses are made for APS-C.

Sony EAdapter · 27.46 mm
Canon RFAdapter · 25.46 mm
Nikon ZAdapter · 29.46 mm
Fujifilm XAdapter · 27.76 mm
L-MountAdapter · 25.46 mm
Micro Four ThirdsAdapter · 26.21 mm
Fujifilm G (GFX)Adapter · 18.76 mm
Canon EF-MAdapter · 27.46 mm
Canon EFAdapter · 1.46 mm
A rear element that sticks out can hit the camera mirror.