Compare Samyang 21mm F1.4 ED AS UMC CS vs Samyang 10mm F2.8 ED AS NCS CS vs Samyang AF 18mm F2.8
Construction
Aperture Blades
9 blades, Circular blades
6 blades, Manual aperture setting via lens ring
7 blades
Colors
Black
Form Factor
Wide-Angle Prime Lens
Ultra Wide-Angle Prime Lens
Ultra Wide-Angle Prime Lens
Image Size
APS-C
APS-C
Full-Frame
Lens Barrel
Physical aperture ring, Distance scale, DoF scale
Physical aperture ring, Distance scale, DoF scale
Lens Mount
Canon EF-M-mount, Fujifilm X-mount, Micro Four Thirds-mount, Sony E-mount
Canon EF-M-mount, Canon EF-mount, Micro Four Thirds-mount, Fujifilm X-mount, Micro Four Thirds-mount, Nikon F-mount, Pentax K-mount, Samsung NX-mount, Sony A-mount, Sony E-mount
Sony E-mount
Motor
Stepper motor
Optical Formula | Elements
8 elements
14 elements
9 elements
Optical Formula | Groups
7 groups
10 groups
8 groups
Optical Formula | Special Glass
3 aspherical and 2 ED elements + Ultra Multi Coating groups
2 aspherical elements, 1 ED glass element groups
2 HR, 3 aspherical, 3 ED elements + UMC coating groups
Dimensions
Filter Diameter
58 mm / 2.28 in
58 mm / 2.28 in
Size | Diameter
64 mm / 2.52 in
86 mm / 3.39 in
64 mm / 2.52 in
Size | Length
68 mm / 2.68 in
77 mm / 3.03 in
61 mm / 2.40 in
Weight
275 g / 9.72 oz
580 g / 20.49 oz
145 g / 5.12 oz
Function
Angle Of View
69.0° Diagonal | 59.5° Horizontal | 41.7° Vertical
110.6° Diagonal | 100.4° Horizontal | 77.3° Vertical
100.5° Diagonal | 90.0° Horizontal | 67.4° Vertical
Aperture
f/1.4 ~ f/22
f/2.8 ~ f/22
f/2.8 ~ f/22
Autofocus
No
No
Yes
Crop Factor
1.5
1.5
Focal Length
21 mm
10 mm
18 mm
Focal Length (35mm Equivalent)
31.5 mm
15.0 mm
Focus Type
Internal
Internal
Image Stabilization
No
No
No
Weather Resistance
No
No
Performance
Max Magnification
0.09x
Min Focus Distance
280 mm / 11.02 in
250 mm / 9.84 in
250 mm / 9.84 in
Production
Accessory
Lens hood included
Lens Hood: Integrated hood (supplied)
Debut
2015-09-21
2013-12-06
2019-08-29
Made In
Korea
Reviews
Neofiliac score
50%
40%
59%
Pros
- Bright maximum aperture
- Very sharp
- Good color rendition
- One of the widest rectilinear lens for APS-C
- Reasonable IQ
- Bright f/2.8 aperture
- Light and compact
- Fast autofocus
- High contrast
- Good sharpness
Cons
- Lacks weather sealing
- Lacks front filter thread
- Low maximum magnification
- Lacks weather sealing
- Focus breathing
- Strong vignetting wide open
- Full plastic construction
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