Compare Samyang 24mm F1.4 ED AS IF UMC vs Pentax-FA 31mm F1.8
Construction
Aperture Blades
9 blades
Colors
Black
Black, silver
Form Factor
Wide-Angle Prime Lens
Wide-Angle Prime Lens
Image Size
Full-Frame
Full-Frame
Lens Barrel
Physical aperture ring, Distance scale, DoF scale
Physical aperture ring, Distance scale, DoF scale
Lens Mount
Canon EF-mount, Nikon F-mount, Micro Four Thirds-mount, Pentax K-mount, Sony A-mount, Sony E-mount, Samsung NX-mount
Pentax K-mount
Material
Aluminum
Motor
Screw drive from camera
Optical Formula | Elements
13 elements
9 elements
Optical Formula | Groups
12 groups
7 groups
Optical Formula | Special Glass
4 ED glass elements, 2 aspherical elements groups
HD + Super Protect coatings groups
Dimensions
Filter Diameter
77 mm / 3.03 in
58 mm / 2.28 in
Size | Diameter
83 mm / 3.27 in
65 mm / 2.56 in
Size | Length
69 mm / 2.72 in
Weight
341 g / 12.05 oz
Function
Angle Of View
84.1° Diagonal | 73.7° Horizontal | 53.1° Vertical
69.9° Diagonal | 60.3° Horizontal | 42.3° Vertical
Aperture
f/1.4 ~ f/22
f/1.8 ~ f/22
Autofocus
No
Yes
Focal Length
24 mm
31 mm
Focus Type
Internal
Image Stabilization
No
Weather Resistance
No
No
Performance
Max Magnification
0.16x
Min Focus Distance
250 mm / 9.84 in
300 mm / 11.81 in
Production
Accessory
Lens hood included
Debut
2011-08-12
2021-02-24
Reviews
Neofiliac score
59%
50%
Pros
- Bright maximum aperture
- Affordable choice in its class
- Comes with physical aperture ring
- Beautifully built
Cons
- Lacks weather sealing
- Not the best IQ
- Not the highest grade of construction
- Only f/1.8 for the price
- Lacks weather sealing
- Unusual focal length
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