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Pentax FA 31mm f/1.8 Limited Lens - Black

Pentax EC80279
Pentax FA 31mm f/1.8 Limited Lens - Black
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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 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.

While retaining the outstanding optical performance of the smc PENTAX-FA 31mm F1.8AL Limited, PENTAX has upgraded the imaging power by paying meticulous attention to the details that can’t simply be measured in numbers alone, and also by applying the SP coating to the front optical element to improve the water/grease-repellent and scratch-resistant performance for easier maintenance.

High-grade lens with superb image rendition and beautiful texture

While inheriting the design concept of the Limited series, this lens was designed through a series of mechanical and numerical evaluations, as well as human assessment of test-shooting samples, to deliver an image rendition unmatched by other models.

The barrel, hood and cap are all made of high-grade aluminum, meticulously machined for an attractive appearance and beautiful texture. It also features a mount pointer with a shippoyaki (cloisonné) finish, which lets the user effortlessly and quickly mount the lens to a camera body.

HD coating for exceptional image rendition

This lens is treated with PENTAX-original HD coating.* Compared with conventional multi-layer coatings, this high-grade coating assures higher light transmittance and lower reflectance to deliver sharp, clear images free of flare and ghost images, even under such adverse lighting conditions as backlight. It elevates the imaging performance a further step up.

* HD stands for High Definition.

Round-shaped diaphragm for beautiful bokeh effect

This lens features a completely round-shaped diaphragm, which produces a natural, beautiful bokeh (defocus) effect in the images captured, while optimizing the imaging performance of the distinctive Limited-series optics contained within.

SP coating to repel dust and protect lens surface

Applied to the front optical element, the PENTAX-developed SP (Super Protect) coating effectively repels water and grease to keep the lens surface free of dust, water and oily substances. This coating is also highly resistant to abrasion and scratches, keeping the lens scratch-free.

Other features

The black model is marked with serial numbers starting with 0000001.  The lens also features an aperture ring to make best use of the range of functions featured in K-mount film-format cameras.

Machined aluminum lens barrel to optimize the texture of the material

Every lens barrel and all exterior components of the PENTAX Limited-series lenses are meticulously machined from high-grade aluminum material to optimize the high-quality visual design and the feel when the photographer touches them. Their elegant shape and distinctive appearance are still loved by many camera enthusiasts today, even as the format of most camera bodies has shifted from analogue to digital.

Exclusively designed lens hoods and slip-on caps to match the character of individual lenses

The lens hood eliminates the need for a reversal of position when the lens is stored, and also lets you start photographing immediately simply by removing the cap from the front end of the lens.

Each lens hood is shaped differently to optimize the optical performance of the individual lens. Electrostatic flocking has been applied to the inside of the lens hood to minimize internal reflection, and also to attract dust particles and prevent them from sticking to the front surface of the lens.

A large aperture and a compact, lightweight design

Under today’s standards, large-aperture lenses are expected to be so heavy and bulky because designers try to optimize resolving power and contrast while minimizing various aberrations.

With FA Limited-series lenses, however, PENTAX has succeeded in achieving these two contradicting goals simultaneously, by making them compact and easy-to-handle through effective control of aberrations, while optimizing the sense of depth and sharpness in resulting images.

Because these lenses deliver image descriptions that truthfully convey the ambience of the image, and also provide the flexibility to change the visual expression with different aperture settings, they are still greatly appreciated by many photographers as truly special lenses.

HD Coating

New-generation HD FA Limited-series lenses are treated with the PENTAX-original HD (High Definition) coating to deliver sharp, clear images, even under varying lighting conditions including backlight. They also feature a round-shaped diaphragm to produce a natural, beautiful bokeh (defocus) effect from open aperture to F3.5 or F4.* These new features combine to further upgrade the imaging power of the three new lenses.

The PENTAX-developed SP (Super Protect) coating has also been applied to the front optical element of these lenses to improve their water/grease-repellent and scratch-resistant performance for easier maintenance.

* The HD PENTAX-FA 31mmF1.8 Limited and HD PENTAX-FA 43mmF1.9 Limited provide a round-shaped diaphragm from open aperture to F3.5, while the HD PENTAX-FA 77mmF1.8 Limited provides this from open aperture to F4.





Angle Of View

70 degrees

Number Of Diaphragm Blades


Minimum Focusing Distance

12 inches

Maximum Magnification



12.2 oz.

Objective Cap


Lens Aperture Ring


Diaphragm Control

Fully automatic

Lens Construction

7 groups 9 elements



Minimum Aperture


Filter Diameter



2.6 x 2.7"





Tripod Adapter


Focal Length

31mm (equiv. 46.5)

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