Pentax Normal Lens, Adapters & Converters | 31mm f1.8 HD FA Limited Black

Focal Length 31mm, Equivalent to 47.5mm in 35mm format (when attached to PENTAX APS-C size DSLR cameras)
Maximum Aperture F1.8
Minimum Aperture F22
Lens Construction 9 elements in 7 groups
Angle of View (Diagonal) 70°, 49° (when attached to PENTAX APS-C size DSLR cameras)
Mount KAF
Minimum Focusing Distance 0.3m (0.98ft.)
Maximum Magnification 0.16x
Filter Diameter 58mm
Diaphragm Control Fully automatic
Number of Diaphragm Blades 9
Rounded diaphragm (31mm:F1.8-F3.5)
Aperture Ring equipped
Tripod Mount N/A
Lens Hood fixed
Lens Cap O-LW65B (included)
Lens Case P70-140 (included)
Maximum Diameter x Length approx. 65mm x 69mm (approx. 2.6in. x 2.7in.)
Weight approx. 341g (approx. 12.0oz.)
Temperature -10°C~40°C (14°F~104°F)
Humidity 85% or less (no condensation)

HD FA 3100 f1.8 Black lens Lens Cap O-LW65B Lens Mount Cap K Lens Case P70-140