The 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.
|Focal length||25 mm|
|Aperture range||2.8 – 22 (1/3 steps)
|Focusing range||0.5 m – ∞
|Number of elements/groups||9/7
|Image ratio at close range||1 : 18|
|Coverage at close range||43 x 65 cm|
|Angular field, diag./horiz./vert.||82°/72°/52 °
||M 46 x 0.75|
|Dimensions (with caps)||ø 53 mm, length 71 mm
Dramatic perspectives and a view from extraordinary image angles – ZEISS lenses 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.
ZEISS T*® ZM-mount lenses are specifically designed to minimize focus shift with aperture changes – an important innovation with big benefits for rangefinder photography. As a result, you can expect improved accuracy of the rangefinder-defined focus. While the precise 10-blade aperture with 1/3 stop interval click stops ensures exact exposure.
Manually focusing a lens means controlling the image result from your fingertips. A good ergonomic design makes all the difference. The user-friendly focusing ring on ZEISS lenses with an ergonomic finger rest is perfect for fast, precise focusing. Changes are immediately visible in the viewfinder. The high-quality focusing mechanism moves smoothly without play, thus also supporting the intuitive interaction with the focal plane.
All lens elements in SLR lenses from ZEISS feature the T*® anti-reflective coating and an optical design that produces brilliant pictures even in unfavorable lighting conditions. We vacuum deposit very thin, transparent coats on the surfaces of the lens elements to make them anti-reflective. Special substances, one by one, are vaporized with very high energy in a high vacuum, which are then deposited on the glass surface as a coating with precisely controlled thicknesses to achieve the desired reduction of reflections. The first coatings were applied by ZEISS back in the 1930s.
The mount and control elements of all ZM lenses are made of metal and are designed for decades of intensive use. The high-quality craftsmanship of the all-metal mounts, the easy-to-grip metal focus and aperture ring and the robust front bayonet and filter threads ensure an amazing photographic experience.
"As for the Zeiss 25 Biogon, I have been wanting to try this lens for over a year. I have seen the results from it on the M8 and M8.2 and every time the image quality was stellar..."
"The Zeiss ZM 25mm f/2.8 Biogon is a relatively inexpensive compared to the Leica alternatives, but a very strong performer...."
"The Zeiss Biogon T* 2,8/25 ZM lens is sure to dazzle even the most stringent of lens critics and one that even Zeiss is proud of. It's capable of some remarkable resolution...."