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Compare Pentax-FA 31mm F1.8 vs Pentax-D FA* 50mm F1.4

Construction

Aperture Blades
9 blades
9 blades
Colors
Black, silver
Black
Form Factor
Wide-Angle Prime Lens
Normal Prime Lens
Image Size
Full-Frame
Full-Frame
Lens Barrel
Physical aperture ring, Distance scale, DoF scale
Distance scale
Lens Mount
Pentax K-mount
Pentax K-mount
Material
Aluminum
Motor
Screw drive from camera
Ring-type ultrasonic
Optical Formula | Elements
9 elements
15 elements
Optical Formula | Groups
7 groups
9 groups
Optical Formula | Special Glass
HD + Super Protect coatings groups
1 aspherical + 3 anamalous dispersion elements, Aero Bright II + HD + Super Protect coatings groups

Dimensions

Filter Diameter
58 mm / 2.28 in
72 mm / 2.83 in
Size | Diameter
65 mm / 2.56 in
80 mm / 3.15 in
Size | Length
69 mm / 2.72 in
106 mm / 4.17 in
Weight
341 g / 12.05 oz
910 g / 32.16 oz

Function

Angle Of View
69.9° Diagonal | 60.3° Horizontal | 42.3° Vertical
46.8° Diagonal | 39.6° Horizontal | 27.0° Vertical
Aperture
f/1.8 ~ f/22
f/1.4 ~ f/16
Autofocus
Yes
Yes
Focal Length
31 mm
50 mm
Focus Type
Internal
Internal
Image Stabilization
No
No
Weather Resistance
No
Yes

Performance

Max Magnification
0.16x
0.18x
Min Focus Distance
300 mm / 11.81 in
400 mm / 15.75 in

Production

Accessory
Lens hood included
Lens hood included
Debut
2021-02-24
2017-10-26

Reviews

Neofiliac score
50%
68%
Pros
  • Comes with physical aperture ring
  • Beautifully built
  • Bright maximum aperture
  • Weather-sealed
  • Very sharp
Cons
  • Only f/1.8 for the price
  • Lacks weather sealing
  • Unusual focal length
  • On the heavy side
  • Slow autofocus

Price

Offers (incl. referral links)
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