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Carl Zeiss Biogon T* 25 mm f/2.8 ZM Lens

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Pictures

Carl Zeiss Biogon T* 25 mm f/2.8 ZM lens

Carl Zeiss Biogon T* 25 mm f/2.8 ZM lens

Carl Zeiss Biogon T* 25 mm f/2.8 ZM lens

MTF-charts

Carl Zeiss Biogon T* 25 mm f/2.8 ZM MTF Chart

Carl Zeiss Biogon T* 25 mm f/2.8 ZM MTF Chart

Carl Zeiss Biogon T* 25 mm f/2.8 ZM MTF Chart

Carl Zeiss Biogon T* 25 mm f/2.8 ZM MTF Chart

Optical design

Carl Zeiss Biogon T* 25 mm f/2.8 ZM optical design

Format: 35mm rangefinder

Type: Prime lens

Focusing: Manual Focus (MF)

Lens mounts: Leica M, Leica M

First year of production: 2004

Optical design: 9 elements in 7 groups

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Average price: $1000

Specifications:

Focal lengthMax. apertureMin. apertureBladesMin. Focus (m.)Filter Ø (mm.)Weight (gr/oz)Length (mm/in)
25mmf/2.8f/22100.546260/9,246.8/1,8

Additional information:

The Carl Zeiss Biogon T* 2.8/25 ZM is a wide-angle fast lens with the T*-coating and 82 degrees of viewing angle, ideally fit for shooting landscapes, cityscapes and architecture  thanks to its almost completely corrected distortion.

According to Camera Lens News (no. 24, Feb., 2006), the Carl Zeiss Biogon T* 25 mm f/2.8 ZM set a new record of resolution - 400 lpmm at the center of the picture at f/4. This value corresponds to the maximum theoretically possible resolution or rated diffraction limit at this aperture setting.

The generated image has a plastic bokeh; the texture of circles of confusion is ideally even. The lens is sharp at the center and on the edges when the aperture is wide open; it has an explicit a 2/3 stop vignetting; the corners are slightly soft. From f/3.5 onwards it produces ideally even field; no vignetting is visible. The CAs are absent. As well as the majority of  the ZM-lenses, the lens doesn't produce flare.

Its immediate competitor is the Leica SUMMILUX-M 24mm f/1.4 ASPH, whose market price is about 6,000$.

It is equipped with the focusing ring with 1/3 stop interval for exact exposure. The delivery kit includes the lens only. The viewfinder and the hood (25/28mm or 21/25mm) are sold separately. However, there is no special need of the hood.


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Posted by: Leopold   Date of publication: 24.12.2011


Mechanical quality5.001
Optical quality5.001
Usability5.001
Pricing / Value5.001
Bokeh5.001
Overall lens rating
5.00

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