Carl Zeiss Touit 12 mm f/ 2.8 Lens 产品宣传册

®

 f/4.5 - 500 mm

  

The basic design of the Mirotar

®

 - concave primary 

mirror with a hole in the center and convex secondary 

mirror - is similar to the design frequently applied in 

astronomical telescopes. It further contains two lens 

elements in front of and two behind the mirror surfaces. 

They reduce the aberrations caused by the mirror to a 

minimum. 
Whereas conventional lenses with a long focal length 

and apertures larger than f/8 exhibit disturbing 

chromatic aberrations, these are completely eliminated 

when mirrors are used. The elements employed for 

correction in the mirror lens are of low refractive 

power and are chromatically corrected so that the focus 

is maintained over the entire photographic spectrum. 

Even in IR photography, the focus is retained once it has 

been set visually. 

The very high uniform image quality of the Mirotar

®

 is 

due not only to the extremely good overall correction, 

but also to the meticulous care taken in the production 

of the mirror and lens systems, the mounts and in the 

assembly of the lens. Distant objects are imaged with 
keen definition in every detail. Pictures taken with the 
Mirotar

®

 lens thus permit considerable subsequent 

enlargement. The high speed permits press and wildlife 

photography even under unfavorable light conditions.

Filters:

slider with screw-in filter S 49

Number of elements:

5 (including primary mirror)

(IR, orange, yellow, UV)

Number of groups:

5

Focusing range:

∞

 to 3.5 m

Max. aperture:

f/4.5

Entrance pupil:

Focal length:

504.5 mm

Position:

on first lens vertex

Negative size:

24 x 36 mm

Diameter:

128.0 mm

Angular field 2w:

diagonal 5º

Exit pupil:

Spectral range:

visible spectrum

Position:

181.0 mm in front of last lens vertex

Aperture scale:

filter turret with neutral density

Diameter:

66.2 mm

filters corresponding to the

Position of principal planes:

f/stops 4, 5, 8 and 11

H:

477.4 mm in front of first lens vertex

Mount.

tube mount with attached bellows.

H':

248.7 mm in front of first lens vertex

Focusing camera adapter for

Distance between first

Contax/Yashica mount

and last lens vertex:

177.6 mm (without filter)

Rollei 3001, 3003

Weight:

approx. 4.5 kg

Further adapters on request.

Vertical/horizontal format can be set