HD PENTAX-FA 31mmF1.8 LimitedAn 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 winter
This 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.
HD PENTAX-FA 31mmF1.8 Limited
20210 Black, 20220 Silver
Equivalent to 47.5mm in 35mm format
(when attached to PENTAX APS-C size DSLR cameras)
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)
Minimum Focusing Distance
Number of Diaphragm Blades
Rounded diaphragm （31mm:F1.8-F3.5）
Maximum Diameter x Length
approx. 65mm x 69mm (approx. 2.6in. x 2.7in.)
85% or less (no condensation)
Lens Cap O-LW65B, Lens Mount Cap K, Lens Case P70-140
SP (Super Protect) Coating