Zeiss Biogon T* 2.8/21 ZM Datasheet
Biogon T* 2.8/21 ZM
The expert for confined spaces and super-wide angle photography Technical Specification
This lens provides image quality clearly beyond that of
any SLR super-wide angle lens. It has been especially
designed for super-wide angle documentation photo-
graphy requiring an extremely high resolving power.
Tiny details can be captured with unparalleled crispness
and accuracy, while distortion is virtually non-existent.
Demanding interiors can be photographed as easily and
quickly as never before. This lens opens up new horizons
and is ideal for extreme landscapes, dynamic architec-
ture and demanding interiors.
Subject to change.
Carl Zeiss AG
Camera Lens Division
73446 Oberkochen
Germany
Tel : + 49 73 64 20-6175
Fax: + 49 73 64 20-40 45
E-Mail: photo@zeiss.de
www.zeiss.de/photo
Focal length: 21mm
Aperture range: 2.8–22
No. of elements/groups: 9/7
Focusing range: 0.5m – infinity
Image ratio at close range: 1:21
Coverage at close range: 47 cm x 71 cm
Angular field, diag./horiz./vert.: 90/80/58°
Filter: M 46 x 0.75
Weight: 300 g
Length: 64 mm
Cat. No. silver: 30 82021
Cat. No. black: 30 82022
Biogon T* 2.8/21 ZM
Performance data
Carl Zeiss AG
Camera Lens Division
73446 Oberkochen
Germany
Tel : + 49 73 64 20-6175
Fax: + 49 73 64 20-40 45
E-Mail: photo@zeiss.de
www.zeiss.de/photo
Modulation transfer T as a function of image height
and slit orientation: sag tan
White light. Spatial frequencies R = 10, 20 and 40
cycles/mm.
f-number: k = 2.8
T (%)
u (mm)
u (mm)
f-number: k = 5.6
T (%)
Distortion in % of image height
V
u (mm)
Relative illuminance
E (%)
u (mm)
Subject to change.
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