N°90170 · Family detail
SigmaWide·PENTAX K mount
Sigma 20mm F/1.8 EX DG ASPH RF
Specifications01
MountPENTAX K
Focal length20mm
Max aperturef/1.8
TypeWide · Prime
Weight520 g
Physical length90 mm
Min focus distance20 m
Summary02
Sigma 20mm f/1.8 wide-angle prime for Pentax K-mount, intended for general photography and low-light wide scenes (e.g., landscapes, interiors).
AI-assisted summary — verify against linked sourcesWhere 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.
No plain adapter reaches infinity focus on: Nikon F.
Other Mounts03
This lens family is also indexed in 3 other mounts.