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The ZEISS Biogon T 2,8/25 ZM delivers high contrast across the entire image field and is virtually free of distortion at full apertures. With the aperture stopped down, detail is finely rendered with a pleasing three-dimensional quality.
The ZEISS Biogon T 2,8/25 ZM delivers high contrast across the entire image field and is virtually free of distortion at full apertures. With the aperture stopped down, detail is finely rendered with a pleasing three-dimensional quality. The lens is rangefinder-coupled for easy focusing and the optional 25/28 mm viewfinder is available for accurate image composition. The Biogon T* 2,8/25 ZM is a creative tool for scenic portraits, inspiring landscapes and expansive architectural photography.
A lens with such a large field angle that it can capture as much of the photographer's surroundings as possible in a single shot – this is the origin of the name Biogon®. The largely symmetrical Biogon optical design enables the use of very compact, moderate to extremely wide-angle lenses, including with rangefinder and mirrorless system cameras. The lenses feature exceptionally good distortion correction, chromatic properties and image field flattening.
The optical elements of ZEISS lenses feature T ® anti-reflective coating on all surfaces and an optical design that guarantees images of superior brilliance at all times, even in unfavourable lighting conditions. We apply the anti-reflective coating to the lens surfaces by the vapour deposition of extremely thin, transparent layers on the glass. In this process, special substances are vaporized with extremely high energy in a high-vacuum environment and are subsequently deposited on the glass surfaces, one after another, as layers with precisely controlled thicknesses to achieve the desired reduction of reflective properties. The first coating techniques were employed by ZEISS as long ago as in the 1930s.
f/2.8 – f/22
Leica M-Mount (ZM)
0,50 m (19.69) – ∞
Angular field (diag. | horiz. | vert.)
82° / 72° / 52°
Coverage at close range (MOD)
470 x 710 mm (18.50 x 27.56)
Image ratio at minimum object distance
1 : 21
Lens elements | groups
9 / 7
M46 x 0.75
Length (without lens caps)
60 mm (2.36)
260 g (9.17 oz)
Zeiss Biogon T* 25mm f/2.8 ZM Lens (Black)46mm Front Lens Cap for ZM LensesRear Lens Cap for ZM-Mount Lenses
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