Site Title

Compare Samyang 20mm F1.8 ED AS UMC vs Zeiss Loxia 21mm F2.8 vs Zeiss Biogon T* 2.8/25 ZM

Reviews

Neo score
59%
86%
70%
Pros
  • Rather affordable
  • Weather-sealed
  • Smooth focus ring
  • Excellent image quality
  • Declickable aperture ring
  • Great build quality
  • Low distortion
Cons
  • Lacks weather sealing
  • Not the highest grade of build
  • Some distortion
  • Low maximum magnification

Price

Offers (incl. referral links)

Construction

Aperture Blades
7 blades
Colors
Black
Silver or black
Form Factor
Ultra Wide-Angle Prime Lens
Ultra Wide-Angle Prime Lens
Wide-Angle Prime Lens
Image Size
Full-Frame
Full-Frame
Full-Frame
Lens Barrel
Physical aperture ring, Distance scale
Physical aperture ring, Distance scale
Physical aperture ring, Distance scale, DoF 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
Sony E-mount
Leica M-mount
Material
Metal
metal barrel, metal mount
Optical Formula | Elements
13 elements
11 elements
9 elements
Optical Formula | Groups
12 groups
9 groups
7 groups
Optical Formula | Special Glass
Two aspherical + 3 ED elements, Ultra Multi Coating groups

Dimensions

Filter Diameter
77 mm / 3.03 in
52 mm / 2.05 in
46 mm / 1.81 in
Size | Diameter
83 mm / 3.27 in
62 mm / 2.44 in
53 mm / 2.09 in
Size | Length
88 mm / 3.46 in
72 mm / 2.83 in
71 mm / 2.80 in
Weight
497 g / 17.56 oz
394 g / 13.92 oz
260 g / 9.19 oz

Function

Angle Of View
94.5° Diagonal | 84.0° Horizontal | 61.9° Vertical
91.7° Diagonal | 81.2° Horizontal | 59.5° Vertical
81.8° Diagonal | 71.5° Horizontal | 51.3° Vertical
Aperture
f/1.8 ~ f/22
f/2.8 ~ f/22
f/2.8 ~ f/22
Autofocus
No
No
No
Focal Length
20 mm
21 mm
25 mm
Focus Type
Internal
Internal
Image Stabilization
No
No
No
Weather Resistance
No
Yes

Performance

Max Magnification
0.13
0.056
Min Focus Distance
200 mm / 7.87 in
250 mm / 9.84 in
500 mm / 19.69 in

Production

Accessory
Lens hood included
Debut
2016-08-08
2015-10-12
Made In
Japan
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