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Pentax smc FA 31mm f/1.8 AL Limited

Pentax smc FA 31mm f/1.8 AL Limited lens
 

Full frame sized image

Lenses that create APS-C sized image are designed for digital only. They cannot be used on cameras that have image sensor larger than the APS-C format. These lenses are not suitable for film cameras either.

 

No Ultrasonic AF

Lenses with ultrasonic focusing mechanism tend to be quiter and faster than traditionally focusing lenses.

 

No stepping motor AF

Lenses with stepping motor focusing mechanism are better for contrast based focusing, and are quiter and faster than traditionally focusing lenses.

 

No Low Dispersion lens element is used

Low Dispersion lens elements help to reduce chromatic aberration.

 

Not stabilized

Image stabilization helps to reduce blur caused by hand shake, especially at high focal length or in low light situations. Image stabilization can give 1 to 3 stop advantage over none stabilized lens, based on the reciprocal rule.

 

The front lens is fixed

The fixed front lens is not rotating during zoom and/or focusing. This allows the photographer to use petal shaped lens hood. Fixed front lenses also make the use of polarization filters a lot easier.

The unique PENTAX smc P-FA 31mm f/1.8 Limited lens offers exceptionally high image and a wide-angle perspective. It incorporates a glass-molded aspherical lens element into its 9-element, 7-group optics, and offers sharp, crisp image reproduction, even at the maximum aperture of f/1.8. It features a beautiful aluminum body with metallic silver finish comes equipped with a flower-shaped lens hood.

Pentax smc FA 31mm f/1.8 AL Limited Specification

Available mount(s) Pentax K
Application(s) Landscape, Architecture
Category(s) Wide angle prime
Multiplier
Stabilizer no
Focal length 31 mm (prime)
Lens construction 9 elements in 7 groups
Angle of view 35mm: 70°
digital: N/A
Number of blades N/A
Maximum aperture f/1.8
Minimum aperture f/22
Minimum focusing distance 30 cm
Magnification 0.16×
Filter size 58 mm
Size ∅ 65 × 68.5 mm
Weight 345 g
Notes built-in lenshood
AF speed N/A
AF sound
Internal focusing N/A
Internal zoom N/A
Fix front lens yes
Mount type N/A
Weather sealed N/A
Drop in filter N/A
Ultrasonic AF no
Stepping motor AF no
APS-C sized circle no
Low dispersion lens element no
Hard case N/A
Soft case N/A
Lens hood included
Tripod adapter N/A
Discontinued yes
Pentax smc FA 31mm f/1.8 AL Limited Specification

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