Compare Pentax-FA 31mm F1.8
Construction
Aperture Blades
9 blades
Colors
Black, silver
Form Factor
Wide-Angle Prime Lens
Image Size
Full-Frame
Lens Barrel
Physical aperture ring, Distance scale, DoF scale
Lens Mount
Pentax K-mount
Material
Aluminum
Motor
Screw drive from camera
Optical Formula | Elements
9 elements
Optical Formula | Groups
7 groups
Optical Formula | Special Glass
HD + Super Protect coatings groups
Dimensions
Filter Diameter
58 mm / 2.28 in
Size | Diameter
65 mm / 2.56 in
Size | Length
69 mm / 2.72 in
Weight
341 g / 12.05 oz
Function
Angle Of View
69.9° Diagonal | 60.3° Horizontal | 42.3° Vertical
Aperture
f/1.8 ~ f/22
Autofocus
Yes
Focal Length
31 mm
Focus Type
Internal
Image Stabilization
No
Weather Resistance
No
Performance
Max Magnification
0.16x
Min Focus Distance
300 mm / 11.81 in
Production
Accessory
Lens hood included
Debut
2021-02-24
Reviews
Neofiliac score
50%
Pros
- Comes with physical aperture ring
- Beautifully built
Cons
- Only f/1.8 for the price
- Lacks weather sealing
- Unusual focal length
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