Carl Zeiss Distagon T* 21mm f/ 2.8 Z Lens Manuel

®

 T* 2.8/21

                                      

®

  G mount

This Biogon

®

 2.8/21 lens bridges the gap 

between the Hologon

®

 T* 8/16 lens and the 

®

 2.8/28 lens for the Contax G lens range. 

With its large field angle across the diagonal, this 
lens is suitable for photography where not only a 
dynamic perspective, but also high image quality 
and minimum distortion are required at the same 
time. Examples include the photography of 
architecture and interiors. The relatively wide 
initial aperture of f/2.8 also allows available-light 
photography of interiors.

The almost symmetrical design of this lens also 
makes it suitable for the close-up range: its 
superb image quality, especially at infinity, is also 
evident in photographs of prototype and 
architectural models.
The Biogon

®

 2.8/21 lens has been designed for 

use with the autofocus connection of the Contax 
G compact cameras.

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Number of elements

9

Close limit field size

485 mm x 728 mm

Number of groups

7

Max. scale

1 : 20.1

Max. aperture

f/2.8

Entrance pupil*

Focal length

21.5 mm

Position

16.4 mm behind the first lens vertex

Negative size

24 x 36 mm

Diameter

7.5 mm

Angular field*

width 80°, height 59°,

Exit pupil*

diagonal 2w 90°

Position

10.7 mm in front of the last lens vertex

Min. aperture

22

Diameter

8.0 mm

Camera mount

Contax G

Position of principal planes*

Filter connection

M 55 x 0,75

H

17.6 mm behind the first lens vertex

Focusing range 

infinity to 0,5 m

H'

9.5 mm

Working distance (between mechanical front end of

Back focal distance

12.1 mm

lens and subject)

0,44 m

Distance between first
and last lens vertex

49.7 mm

Weight

200 g

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* at infinity