Carl Zeiss Distagon T* 25 mm f/ 2.8 C/Y Lens Техническое Руководство
Distagon
®
T
* f/2.8 - 25 mm
The 25 mm Distagon
®
T
* f/2.8 lens with an
angular field of 80º is a lens of well-known and
time-honoured design enjoying a good reputation
with the users of 35 mm cameras.
time-honoured design enjoying a good reputation
with the users of 35 mm cameras.
Even at full aperture, the 25 mm Distagon
®
lens
provides excellent image quality over the entire
format although its initial aperture can be regarded
as considerable for such a fairly powerful
wide-angle lens. The treatment of the glass-to-air
surfaces with the T
format although its initial aperture can be regarded
as considerable for such a fairly powerful
wide-angle lens. The treatment of the glass-to-air
surfaces with the T
* multilayer coating - its
anti-reflection effect is particularly conspicuous with
multi-element wide-angle lenses - guarantees a
brilliant image even with high object contrast and
multi-element wide-angle lenses - guarantees a
brilliant image even with high object contrast and
provides extensive protection against unwanted
reflections when backlighting is used.
Within the varied applications of wide-angle
photography, the use of the 25 mm Distagon
reflections when backlighting is used.
Within the varied applications of wide-angle
photography, the use of the 25 mm Distagon
®
T
*
f/2.8 lens is also of advantage for architectural and
landscape photography where, on the one hand, a
relatively large object field has to be covered and
where, on the other, the details on the periphery of
the image have to be rendered as true to the
original as possible - i.e. without too pronounced
perspective distortion.
landscape photography where, on the one hand, a
relatively large object field has to be covered and
where, on the other, the details on the periphery of
the image have to be rendered as true to the
original as possible - i.e. without too pronounced
perspective distortion.
Cat. No. of lens: 10 48 37 Weight: approx. 380 g
Number of elements: 8 Focusing range:
Number of elements: 8 Focusing range:
∞
to 0.25 m
Number of groups: 7 Entrance pupil:
Max. aperture: f/2.8 Position: 23.0 mm behind the first lens vertex
Focal length: 25.9 mm Diameter: 9.1 mm
Negative size: 24 x 36 mm Exit pupil:
Angular field 2w: diagonal 82º Position: 16.6 mm in front of the last lens vertex
Mount: focusing mount with bayonet; Diameter: 19.8 mm
Max. aperture: f/2.8 Position: 23.0 mm behind the first lens vertex
Focal length: 25.9 mm Diameter: 9.1 mm
Negative size: 24 x 36 mm Exit pupil:
Angular field 2w: diagonal 82º Position: 16.6 mm in front of the last lens vertex
Mount: focusing mount with bayonet; Diameter: 19.8 mm
TTL metering either at full aperture Position of principal planes:
or in stopped-down position. H: 36.7 mm behind the first lens vertex
Aperture priority/Shutter priority/ H': 12.7 mm behind the last lens vertex
Automatic programs Back focal distance: 37.8 mm
(Multi-Mode Operation) Distance between first and
or in stopped-down position. H: 36.7 mm behind the first lens vertex
Aperture priority/Shutter priority/ H': 12.7 mm behind the last lens vertex
Automatic programs Back focal distance: 37.8 mm
(Multi-Mode Operation) Distance between first and
Aperture scale: 2.8 - 4 - 5.6 - 8 - 11 - 16 - 22 last lens vertex: 60.2 mm
Filter connection: clip-on filter, diameter 59 mm
Filter connection: clip-on filter, diameter 59 mm
filter thread M 55 x 0.75