Focal Length 50mm
Equivalent to 76.5mm in 35mm format (when attached to PENTAX APS-C size DSLR cameras)
Maximum Aperture F1.4
Minimum Aperture F16
Lens Construction 15 elements in 9 groups
Angle of View (Diagonal) 47°(when attached to PENTAX 35mm full-frame SLR cameras)
31.5°(when attached to PENTAX APS-C size DSLR cameras)
Mount KAF4
Minimum Focusing Distance 0.4m (1.3ft.)
Maximum Magnification 0.18x
Filter Diameter 72mm
Diaphragm Control Electromagnetic diaphragm
Fully automatic
Number of Diaphragm Blades 9
Rounded diaphragm (50mm:F1.4-F2.8)
Aperture: Ring N/A
Tripod Mount N/A
Lens Hood PH-RBB72 (included)
Lens Cap O-LC72 (included)
Lens Case S100-140 (included)
Maximum Diameter x Length approx. 80mm x 106mm (approx. 3.1in. x 4.2in.)
Weight approx. 910g / with hood approx. 955g
(approx. 32.1 oz./ with hood approx. 33.7oz.)
Temperature -10°C~40°C (14°F~104°F)
Humidity 85% or less (no condensation)
Included Accessories Lens Hood PH-RBB72, Lens Cap O-LC72,
Lens Mount Cap K,Lens Case S100-140
Others HD Coating
Aero Bright Coating II
SP (Super Protect) Coating
AW (All Weather Resistant)
Quick-shift Focus System (QFS/M)
SDM (Ultrasonic Motor)