Compare Samyang 20mm F1.8 ED AS UMC vs Tamron 17-35mm F/2.8-4 Di OSD vs Tamron 28-75mm F/2.8 Di III
Construction
Aperture Blades
7 blades
7 blades
9 blades
Colors
Black
Black
Form Factor
Ultra Wide-Angle Prime Lens
Wide-Angle Zoom Lens
Standard Zoom Lens
Image Size
Full-Frame
Full-Frame
Full-Frame
Lens Barrel
Physical aperture ring, Distance scale
Lens Mount
Canon EF-mount, Canon EF-M-mount, Fujifilm X-mount, Micro Four Thirds-mount, Nikon F-mount, Pentax K-mount, Samsung NX-mount, Sony A-mount, Sony E-mount
Canon EF-mount, Nikon F-mount
Sony E-mount
Motor
Micromotor
Stepper motor
Optical Formula | Elements
13 elements
15 elements
15 elements
Optical Formula | Groups
12 groups
10 groups
12 groups
Optical Formula | Special Glass
Two aspherical + 3 ED elements, Ultra Multi Coating groups
LD/GM elements, BBAR/fluorine coatings groups
Molded glass, hybrid aspherical, low dispersion, extra low dispersion + BBAR and fluorine coatings groups
Dimensions
Filter Diameter
77 mm / 3.03 in
77 mm / 3.03 in
67 mm / 2.64 in
Size | Diameter
83 mm / 3.27 in
84 mm / 3.31 in
73 mm / 2.87 in
Size | Length
88 mm / 3.46 in
93 mm / 3.66 in
117 mm / 4.61 in
Weight
497 g / 17.56 oz
460 g / 16.25 oz
550 g / 19.43 oz
Function
Angle Of View
94.5° Diagonal | 84.0° Horizontal | 61.9° Vertical
103.7° Diagonal | 93.3° Horizontal | 70.4° Vertical (wide) ~ 63.5° Diagonal | 54.4° Horizontal | 37.8° Vertical (tele)
75.4° Diagonal | 65.5° Horizontal | 46.4° Vertical (wide) ~ 32.2° Diagonal | 27.0° Horizontal | 18.2° Vertical (tele)
Aperture
f/1.8 ~ f/22
f/2.8–4 ~ f/16–22
f/2.8 ~ f/22
Autofocus
No
Yes
Yes
Focal Length
20 mm
17 mm ~ 35 mm
28 mm ~ 75 mm
Focus Type
Internal
Internal
Internal
Image Stabilization
No
No
No
Weather Resistance
No
Yes
Yes
Zoom Type
External zoom
External zoom
Performance
Max Magnification
0.2x
0.34x
Min Focus Distance
200 mm / 7.87 in
280 mm / 11.02 in
190 mm / 7.48 in
Production
Accessory
Lens hood included
Lens hood included
Lens hood included
Debut
2016-08-08
2018-08-06
2018-02-22
Model Name
A037
A036
Reviews
Neofiliac score
59%
69%
69%
Pros
- Rather affordable
- Weather-sealed
- Compact and lightweight
- Weather-sealed
- Excellent image quality
- Rather compact for an f/2.8 standard zoom
Cons
- Lacks weather sealing
- Not the highest grade of build
- External zoom without zoom lock
- Variable aperture
- Not the sharpest
- External zoom without zoom lock
- Not the most solid build
- Only reaches 28mm
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