Compare Voigtlander 21mm F1.8 Ultron vs Zeiss Biogon T* 2.8/25 ZM vs Zeiss Planar T* 2/50 ZM
Construction
Aperture Blades
10 blades
Colors
Silver or black
Silver or black
Form Factor
Ultra Wide-Angle Prime Lens
Wide-Angle Prime Lens
Normal Prime Lens
Image Size
Full-Frame
Full-Frame
Full-Frame
Lens Barrel
Physical aperture ring, Distance scale, DoF scale
Physical aperture ring, Distance scale, DoF scale
Physical aperture ring, Distance scale, DoF scale
Lens Mount
Leica M-mount
Leica M-mount
Leica M-mount
Material
Metal barrel, metal mount
metal barrel, metal mount
metal barrel, metal mount
Optical Formula | Elements
13 elements
9 elements
6 elements
Optical Formula | Groups
11 groups
7 groups
4 groups
Optical Formula | Special Glass
Aspherical element groups
Dimensions
Filter Diameter
58 mm / 2.28 in
46 mm / 1.81 in
43 mm / 1.69 in
Size | Diameter
62 mm / 2.44 in
53 mm / 2.09 in
52 mm / 2.05 in
Size | Length
92 mm / 3.62 in
71 mm / 2.80 in
68 mm / 2.68 in
Weight
412 g / 14.56 oz
260 g / 9.19 oz
230 g / 8.13 oz
Function
Angle Of View
91.7° Diagonal | 81.2° Horizontal | 59.5° Vertical
81.8° Diagonal | 71.5° Horizontal | 51.3° Vertical
46.8° Diagonal | 39.6° Horizontal | 27.0° Vertical
Aperture
f/1.8 ~ f/22
f/2.8 ~ f/22
f/2 ~ f/22
Autofocus
No
No
No
Focal Length
21 mm
25 mm
50 mm
Image Stabilization
No
No
Weather Resistance
No
Performance
Max Magnification
0.056
0.083
Min Focus Distance
500 mm / 19.69 in
500 mm / 19.69 in
700 mm / 27.56 in
Production
Accessory
Lens Hood: Non-detachable hood (supplied)
Debut
2012-09-17
Made In
Japan
Reviews
Neofiliac score
88%
70%
78%
Pros
- Solid all-metal construction
- Very sharp
- Great sunstar
- Quite bright aperture
- Great build quality
- Low distortion
- Compact and lightweight
- Beautiful construction
Cons
- Low maximum magnification
- Lacks weather sealing
- Low maximum magnification
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