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Zeiss Distagon T* 2/25

Zeiss Distagon T* 2/25
Zeiss Distagon T* 2/25
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Initial Price: 
$1700
  • Two Aspheric optical surfaces
  • Floating Elements Design
  • 9 Blades (Rounded diaphragm)
  • Metal mount
Zeiss Distagon T* 2/25
Zeiss Distagon T* 2/25 front element view
Zeiss Distagon T* 2/25 rear element view
Zeiss Distagon T* 2/25
Zeiss Distagon T* 2/25 lens construction
MTF Charts: 
Zeiss Distagon T* 2/25 mtf chart at f/2.0
Zeiss Distagon T* 2/25 mtf chart at f/4.0

Overview

Description by Zeiss:

The Distagon T* 2/25 enables creative photography with interesting perspectives – even in difficult lighting conditions. Without a tripod, exquisitely sharp, wide-angle shots work every time. The large angular field creates a dynamic yet natural effect. With excellent image quality from the widest aperture onwards, the Distagon T* 2/25 achieves great results – from interiors to stunning outdoor expanses.

Useful features such as two aspheric lens elements surfaces to correct distortion and a floating elements design ensure that you can vividly capture details framed from your own, unique perspective.

Aspherical design

zeiss_aspherical_design
The aspherical lens design ensures consistent imaging performance throughout the entire focusing range as well as sharpness to the periphery of the image. The asphere's more complex surface profile can reduce or eliminate spherical aberration and also reduce other optical aberrations compared to a simple lens.

Floating Elements Design

zeiss_floating_elements_design
State-of-the-art camera techniques and high-resolution digital image sensors increasingly demand more from the lenses. The modern floating element design compensates aberrations of the Carl Zeiss SLR lenses at different distance settings. This is accomplished by changing the axial distance of single lens elements or element groups to each other. The adjustment of the element distance is coupled to the distance setting so that it always results in the right correction. The mechanical design of these lens elements is very complex and the workmanship must be particularly exact – both specialties of Carl Zeiss.

Virtually distortion-free optics
Dramatic perspectives and a view from extraordinary image angles – SLR lenses from Carl Zeiss open up new composition possibilities. Distortion would disrupt the composition because straight lines, whose image does not go through the image center, would be reproduced with a curved shape.  This annoying effect is accordingly and largely compensated through elaborate optical designs at all focal lengths.

Ideal aperture with nine blades

Zeiss-nine_blades_aperture
Photographers want to guide the observer through the image. Minimal depth of focus is often used as a design element. This keeps the background intentionally blurred to keep the attention of the observer on the main subject. These different representations of the blurred areas, as well as the quality of the transition, are referred to as the Bokeh of a lens. The finely tuned features of the optical design on Carl Zeiss SLR lenses ensure a particularly harmonious effect of the blurred areas of the image. The nine diaphragm blades and the resulting, virtually circular aperture on Carl Zeiss SLR lenses are crucial to favorable rendition of highlights in the fore and background.

High-Speed Lens
Great low-light shots start with a great lens for your DSLR camera. A high-speed lens captures as much light as possible. A lens with a wide maximum aperture offers the best results in difficult lighting conditions.

 

 

 

Carl Zeiss Lenses for SLR Cameras - Camera Mounts

The manually focusable Carl Zeiss SLR lenses are available with EF bayonet (ZE), F bayonet (ZF.2). The possibilities of using scene programs, different types of exposure metering and individualized functions can be varied depending on the camera model.

 

zeiss-lenses-_zf2 ZF.2 Lenses
Lenses with F mount equipped with AI-apperture coupling and CPU
zeiss-lenses ze mount ZE Lenses
Lenses equipped with an EF bayonet for EOS cameras from Canon

 

Reviews

Specifications

Initial Price: 
$1700
Release Date: 
10/2011
DXO Mark Score
Resolution: 
22.0 P-Mpix
Transmission: 
2.3 TStop
Distortion: 
0.50%
Vignetting: 
-2.3 EV
Chr. aberration: 
5.00µm
Specifications
Lens type: 
Fixed Focal Length
Lens Mount: 
Nikon F mount
Canon EF mount
Canon EFS mount
AF Motor type: 
Manual Focus Only
Optical characteristics
Focal Length: 
25mm
Angle of view: 
81°
Zoom Ratio: 
1.0x
Max Magnification: 
0.2x
Lens construction: 
11 lens elements in 10 groups (2 Aspheric optical surfaces)
Diaphragm Blades: 
9 aperture blades circular opening
Maximum Aperture: 
f/2.0
Minimum Aperture: 
f/22.0
Aperture ring: 
Yes
Internal Focusing: 
No
Front lens element rotating: 
No
Minimum Focusing Distance: 
0.25m
Distance Scale: 
Yes
Full-Time manual focus: 
No
Auto Focus / Manual Focus switch: 
No
Stabilization system : 
No
Physical characteristics
Diameter: 
71.0mm
Length: 
95.0mm
Weight: 
570.0 g
Body material: 
Metal
Weather sealing: 
No
Filter Diameter: 
67 mm
Lens Hood included: 
Yes

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