Focal length 43mm 

Equivalent to 66mm in 35mm format 

(with Pentax APS-C size SLR camera) 

Aperture F1.9 

Minimum aperture F22 

Lens construction 7 elements in 6 groups 

Angle of view (diagonal) 53° 

(with Pentax 35mm full size SLR camera) 

36.5° 

(with Pentax APS-C size SLR camera) (with Pentax APS-C size SLR camera) 

Mount Type KAF 

Minimum Focusing Distance 0.45m 

Maximum Magnification 0.12x 

Filter Diameter 49mm 

Light Quantity Control System Fully Automatic Aperture 

Number of Aperture Blades 8 

Circular Aperture (43mm:F1.9-F3.5) 

Aperture Ring Yes