Compare Samyang 12mm F2.8 ED AS NCS Fisheye vs Pentax-D FA 21mm F2.4ED vs Pentax-D FA* 50mm F1.4
Construction
Aperture Blades
7 blades, Circular blades
8 blades, Rounded diaphragm
9 blades
Colors
Black
Black, Silver
Black
Form Factor
Ultra Wide-Angle Prime Lens
Ultra Wide-Angle Prime Lens
Normal Prime Lens
Image Size
Full-Frame
Full-Frame
Full-Frame
Lens Barrel
Physical aperture ring, Distance scale
Distance scale, DoF scale
Distance scale
Lens Mount
Canon EF-mount, Nikon F-mount, Pentax K-mount, Sony A-mount, Sony E-mount
Pentax K-mount
Pentax K-mount
Material
Aluminum
Motor
Ring-type ultrasonic
Optical Formula | Elements
12 elements
11 elements
15 elements
Optical Formula | Groups
8 groups
8 groups
9 groups
Optical Formula | Special Glass
2 aspherical, 3 ED, nano coating system groups
4 ED elements, 1 Super ED element groups
1 aspherical + 3 anamalous dispersion elements, Aero Bright II + HD + Super Protect coatings groups
Dimensions
Filter Diameter
67 mm / 2.64 in
72 mm / 2.83 in
Size | Diameter
77 mm / 3.03 in
74 mm / 2.91 in
80 mm / 3.15 in
Size | Length
73 mm / 2.87 in
89 mm / 3.50 in
106 mm / 4.17 in
Weight
515 g / 18.20 oz
416 g / 14.70 oz
910 g / 32.16 oz
Function
Angle Of View
180° Diagonal (fisheye)
91.7° Diagonal | 81.2° Horizontal | 59.5° Vertical
46.8° Diagonal | 39.6° Horizontal | 27.0° Vertical
Aperture
f/2.8 ~ f/22
f/2.4–22 ~ f/2.4–22
f/1.4 ~ f/16
Autofocus
No
Yes
Yes
Focal Length
12 mm
21 mm
50 mm
Focus Type
Internal
Internal
Internal
Image Stabilization
No
No
No
Weather Resistance
No
Yes
Yes
Performance
Max Magnification
0.26x
0.18x
Min Focus Distance
200 mm / 7.87 in
180 mm / 7.09 in
400 mm / 15.75 in
Production
Accessory
Lens hood included
Lens hood included
Lens hood included
Debut
2014-11-01
2021-10-21
2017-10-26
Reviews
Neofiliac score
40%
76%
68%
Pros
- 180° FOV
- Reasonably good sunstar
- Weather-sealed
- Great image quality
- 8-bladed aperture for sunstars
- Bright maximum aperture
- Weather-sealed
- Very sharp
Cons
- Lacks front filter thread
- Lacks weather sealing
- Not the sharpest
- On the heavy side
- Slow autofocus
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