Zeiss Leica M mount Ultra-wide prime
Zeiss Biogon T* 21mm f/2.8 ZM
Quick answer
The Zeiss Biogon T* 21mm f/2.8 ZM is a ultra-wide prime lens covering 21mm at f/2.8 for the Leica M mount. Its bright maximum aperture handles indoor and evening light reasonably well.
- Full frame
- APS-C (32mm equiv.)
- Micro Four Thirds (42mm equiv.)
- Other systems via mount adapter
- 20 Leica M cameras
- Focal
- 21mm
- Aperture
- f/2.8–22
- Weight
- 280g
- Filter
- 46mm
- Min focus
- 0.5m
- AF motor
- None
What 21mm sees
- Full frame crop 1.0×
- 91.7° 81.2° horizontal
- APS-C crop 1.5× → 32mm
- 69° 59.5° horizontal
- Micro Four Thirds crop 2.0× → 42mm
- 54.5° 46.4° horizontal
Diagonal angle of view. Frames drawn to scale at 21mm. Calculated from the focal length and crop factor (adapted mount, so sensor size depends on your camera), not measured.
Open the field-of-view calculatorZeiss Biogon T* 21mm f/2.8 ZM specifications
Optics
- Focal length
- 21mm
- Maximum aperture
- f/2.8
- Minimum aperture
- f/22
- Format coverage
- Full frame
- Optical construction
- 9 elements in 7 groups
Focus
- Autofocus motor
- None
- Minimum focus distance
- 0.5 m
- Maximum magnification
- 0.05×
Physical
- Filter thread
- 46 mm
- Weight
- 280 g
- Length
- 64 mm
Specification source: zeiss.com
What can you shoot with the Zeiss Biogon T* 21mm f/2.8 ZM?
At 21mm this is a ultra-wide prime, which typically suits:
- Landscapes and big skies
- Architecture and interiors
- Astrophotography and night skies
Its bright maximum aperture handles indoor and evening light reasonably well.
Frequently asked questions
What mount does the Zeiss Biogon T* 21mm f/2.8 ZM use?
It uses the Leica M mount, so it fits Leica M cameras directly and can be used on other systems through a mount adapter.
What is the focal length of the Zeiss Biogon T* 21mm f/2.8 ZM?
It is a fixed 21mm lens with a maximum aperture of f/2.8. That makes it a ultra-wide lens.
Is the Zeiss Biogon T* 21mm f/2.8 ZM a prime or a zoom lens?
It is a prime lens with a fixed 21mm focal length. Primes usually open wider than zooms; this one opens to f/2.8.
What is the Zeiss Biogon T* 21mm f/2.8 ZM equivalent on a crop sensor?
On APS-C (1.5x crop) it frames like 32mm on full frame, with a 59.5° horizontal and 69° diagonal field of view. On Micro Four Thirds (2x crop) it frames like 42mm on full frame, with a 46.4° horizontal and 54.5° diagonal field of view. These figures are calculated from the focal length and crop factor.
Which cameras does the Zeiss Biogon T* 21mm f/2.8 ZM fit?
Any Leica M-mount camera, including Leica M (Typ 240), Leica M-D (Typ 262), Leica M10-D, Leica M10-P, and Leica M10-R and 15 more.
Alternatives for Leica M from other brands
All Leica M lensesSame mount, overlapping focal range, closest maximum aperture first.