• Brand
  • Products
  • Store
  • Support

K-mount Lenses

Discontinued : Wide-Angle Lenses Wide-Angle Lenses Standard Lenses Telephoto Lenses Macro Lenses

smc PENTAX-FA 31mmF1.8AL Limited

  • 35mm Full Frame
  • APS-C
  • Single Focus
  • FA Limited

Focal length of 31mm for opening up new possibilities in wide-angle expression.

This lens uses glass-molded aspherical and high-reflection, low dispersion lenses together with a large aperture of F1.8 for sharp imaging performance with natural perspective and high contrast, and the floating lens system allows proper imaging performance at all shooting distances for providing exceptional image quality for every situation. A flower-shaped hood is also integrated in the design for easy operation of circular polarizing filters.

Body AF Aperture Ring Aspherical Lens (AL)


Case / Dedicated Lens Caps Included, Hood Built-in
JAN-Code / 4961333 051151


Case / Dedicated Lens Caps Included, Hood Built-in
JAN-Code / 4961333 051137

Sample Images

  • Aperture F5.6, Shutter speed 1/400sec, Focal length 31.0mm, White balance Cloudy, ISO sensitivity 100, Finishing touch Bright

    Click here to see works by users

Features / Specifications

Focal length of 31mm
A focal length of 31mm is used, which is almost exactly midway between the 35mm and 28mm standard wide lenses. This provides a unique angle of view that can draw out the best points of each focal length based on how the shot is framed.
High imaging performance and stunning expressive capability
This lens provides sharp imaging, strong sense of perspective, large depth of field, and other exceptional characteristics for sharp, crystal-clear images in a general wide lens, and also incorporates abundant gradations, detailed reproduction of dark shades, and natural, soft out-of-focus (bokeh) effect called "imaging flavors". This lens enables sharp, smooth imaging even for continuous images when shooting from near to far distances.
Floating lens system
This lens uses a "floating lens system" where the space between a portion of the lens system is changed based on the shooting distance for correcting the various types of aberrations that occur at all shooting distances. This is effective in correcting the field curvature that tends to occur when shooting at close distances with a large aperture wide angle lens.
Other features
1.Elegant and refined finish of machined aluminum unique to the "Limited series" products
2.Deformed flower-shaped hood integrated with lens front frame that enables attachment of filters
3."Finger points" with Shippo-yaki finish* for heightening the sense of attachment to the camera body

*Shippo-yaki is one by one handmaid material, therefore the tone of a color differs individually.

Type Wide
Focal length (Equivalent to 35mm format) 31mm(47.5mm)
Maximum aperture F1.8
Minimum aperture F22
Angle of View 49°
Lens construction 9 elements / 7 groups
No. of diaphragm blades 9
Closest focusing distance 0.3m
Maximum reproduction ratio 0.16x
Filter size 58mm
Diameter x length 65 x 68.5 mm
Weight 345g

Compatible Converters (Click here for details)


*When mounted, this converter closes down the lens’s maximum aperture by one stop.

Related AccessoriesLens-related accessories list

Recommended contents


Page top