Hologon T* 8/16
®
Hologon T* 8/16
53
29 to film
11
®
CONTAX G mount
®
The short focal length of 16 mm and the fixed
Using the traditional Hologon ultra-wide-angle
®
aperture of f/8 of the Hologon T* lens often
lens as a basis, Carl Zeiss has designed a 16 mm
®
allow photography using the fix-focus setting. The
Hologon f/8 lens for the Contax G compact
wide field angle of this lens opens up interesting
cameras. This interchangeable wide-angle lens is
perspectives to the Contax G photographer:
virtually distortion-free and provides superior
whether it is architectural, advertising, fashion or
image quality.
landscape photography, pictures taken with this
In view of the extreme field angle, a loss in
lens will always capture the viewer's attention.
brightness towards the image edges is inevitable.
For this reason, a Contax gradation filter 4x is
available to eliminate this effect.
_________________________________________________________________________________________
Cat. No. of lens
Number of elements
Number of groups
Max. aperture
Focal length
Negative size
Angular field*
10 49 27
5
3
f/8
16.5 mm
24 x 36 mm
width 95°, height 72°,
diagonal 2w 105°
Min. aperture
8 (fixed)
Camera mount
Contax G
Filter connection
special bayonett for
Contax gradation filter
Focusing range
infinity to 0,3 m
Working distance (between mechanical front end of
lens and subject)
0.26 m
Close limit field size
675 mm x 1012 mm
Max. scale
1 : 28.1
Entrance pupil*
Position
20.8 mm behind the first lens vertex
Diameter
2.1 mm
Exit pupil*
Position
9.5 mm in front of the last lens vertex
Diameter
2.0 mm
Position of principal planes*
H
20.6 mm behind the first lens vertex
H'
9.7 mm in front of the last lens vertex
Back focal distance
6.8 mm
Distance between first
and last lens vertex
31.7 mm
Weight
120 g
_________________________________________________________________________________________
* at infinity
Performance data:
®
Hologon T* 8/16
Cat. No. 10 49 27
1. MTF Diagrams
The image height u - calculated from the
image center - is entered in mm on the
horizontal axis of the graph. The
modulation transfer T (MTF = M
odulation Transfer Factor) is entered on
the vertical axis. Parameters of the
graph are the spatial frequencies R in
cycles (line pairs) per mm given at the
top of this page.
The lowest spatial frequency
corresponds to the upper pair of curves,
the highest spatial frequency to the lower
pair. Above each graph, the f-number k
is given for which the measurement was
made. "White" light means that the
measurement was made with a subject
illumination having the approximate
spectral distribution of daylight.
Unless otherwise indicated, the
performance data refer to large object
distances, for which normal
photographic lenses are primarily used.
2. Relative illuminance
In this diagram the horizontal axis gives
the image height u in mm and the
vertical axis the relative illuminance E,
both for full aperture and a moderately
stopped-down lens. The values for E are
determined taking into account
vignetting and natural light decrease.
3. Distortion
Here again the image height u is entered
on the horizontal axis in mm. The
vertical axis gives the distortion V in %
of the relevant image height. A positive
value for V means that the actual image
point is further from the image center
than with perfectly distortion-free
imaging (pincushion distortion); a
negative V indicates barrel distortion.
Subject to change.
Printed in Germany 31.07.2000
Carl Zeiss
Photoobjektive
D-73446 Oberkochen
Telephone (07364) 20-6175
Fax (07364) 20-4045
eMail: [email protected]
http://www.zeiss.de
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