Compare Zeiss Biogon T* 2.8/21 ZM vs 7Artisans M28mm F1.4 vs 7Artisans M50mm F1.1
Construction
Aperture Blades
13 blades
12 blades
Colors
Silver or black
Black
Black
Form Factor
Ultra Wide-Angle Prime Lens
Manual focus lens, 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
Lens Mount
Leica M-mount
M-mount
Leica M-mount
Material
metal barrel, metal mount
Aluminum
Optical Formula | Elements
9 elements
11 elements
7 elements
Optical Formula | Groups
7 groups
9 groups
6 groups
Optical Formula | Special Glass
1x aspherical, 2x ED groups
Dimensions
Filter Diameter
46 mm / 1.81 in
52 mm
55 mm / 2.17 in
Size | Diameter
53 mm / 2.09 in
60 mm / 2.36 in
Size | Length
75 mm / 2.95 in
49 mm / 1.93 in
Weight
280 g / 9.89 oz
488 g
400 g / 14.13 oz
Function
Angle Of View
91.7° Diagonal | 81.2° Horizontal | 59.5° Vertical
75°
46.8° Diagonal | 39.6° Horizontal | 27.0° Vertical
Aperture
f/2.8 ~ f/22
F/1.4 ~ f/16
f/1.1 ~ f/16
Autofocus
No
No
Focal Length
21 mm
28 mm
50 mm
Focus Type
Internal
Image Stabilization
No
N/A
No
Weather Resistance
No
Performance
Max Magnification
0.048
Min Focus Distance
500 mm / 19.69 in
70 cm
700 mm / 27.56 in
Production
Accessory
Lens hood included
Debut
2018-11
2017-12-09
Made In
China
Reviews
Neofiliac score
78%
68%
Pros
- Great build quality
- Good image quality
- Bright maximum aperture
- Short barrel
- 12-bladed aperture produces well-defined sunstars
- Better built than most 7Artisan lenses
Cons
- Low maximum magnification
- Lacks weather sealing
- Voigtlander and Zeiss have stronger alternatives
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