HD PENTAX-FA 31mmF1.8 Limited
An exceptional lens that delivers the sharp, high-contrast, well-defined images that faithfully depict the ambience of the scene — even to the very tips of a bare tree’s branches in winterThis lens has a 31mm focal length, which provides a slightly broader angle of view than more conventional 35mm lenses, to expand the possibilities of wide-angle photography.
This lens inherits the proven optics of the smc PENTAX-FA 31mm F1.8AL Limited, and incorporates high-grade optical components — such as glass-molded, aspherical elements and high-refraction, low-dispersion glass elements — to deliver sharp, well-defined images of small subjects, such as the very tips of a bare, leafless tree’s branches in winter.
...
To further improve imaging power, it also features a newly applied HD coating to produce clear, crisp images even under demanding conditions, and a completely round-shaped diaphragm to deliver a natural, beautiful bokeh (defocus) effect from open aperture to F3.5.
Product specifications
HD PENTAX-FA 31mmF1.8 Limited
20210 Black, 20220 Silver
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°(when attached to PENTAX 35mm full-frame SLR cameras)
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
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)
Included Accessories
Lens Cap O-LW65B, Lens Mount Cap K, Lens Case P70-140
Others
HD Coating
SP (Super Protect) Coating