The Biogon T 4,5/21 ZM offers outstanding performance and extreme resolving power even when shot wide open, with virtually no distortion, excellent control of flare and ghosting and superb contrast rendition across the entire frame.
The Zeiss silver C Biogon T 21mm f/4.5 ZM is a super wide-angle prime for M-mount rangefinder cameras. Its 'C' designation reflects the lens's compact form factor and classic optical design to produce imagery with true color fidelity and natural rendering. The Biogon optical concept helps to ensure virtually no distortion, and this eight elements, six groups layout also maintains a high degree of sharpness and clarity. Additionally, a T anti-reflective coating has also been applied to reduce lens flare and ghosting for improved contrast in strong lighting conditions.
Experiment with different angles and form a unique view of the world with this fast, super-wide angle lens.
The Biogon T* 4,5/21 ZM offers outstanding performance and extreme resolving power even when shot wide open, with virtually no distortion, excellent control of flare and ghosting and superb contrast rendition across the entire frame. The lens is rangefinder coupled for easy focusing and the optional 21 mm viewfinder is available for accurate image composition. The Biogon T* 4,5/21 ZM is suitable for many different wide-angle applications including reportage work, landscape and architectural photos.
The range of ZEISS T*® lenses offers the highest possible standards in terms of performance, reliability and, of course, image quality. Quite simply, they are superior in every way. You can count on highly advanced flare control for crisp and brilliant images, for example. And virtually zero geometric distortion, ensuring precise accuracy when reproducing shapes – especially useful when photographing products and architecture.
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.
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.
Richly saturated and vivid colours are a must in the creation of lasting impressions. However, stray light within an optical system leads to a lightening of the image that is particularly noticeable in the shadows. This reduces image contrast, with the result that exposures lack contrast and appear faded. To avoid this, ZEISS combines various specially developed technologies to reduce the undesirable effects of stray light.
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.
f/4.5 to f/22
Camera Mount Type
Angle of View
Minimum Focus Distance
1.6 / 50 cm
8 elements in 6 groups
2.1 x 1.2 / 53 x 31 mm
6.7 oz / 190 g
Zeiss C Biogon T* 21mm f/4.5 ZM Lens (Silver)46mm Front Lens Cap for ZM LensesRear Lens Cap for ZM-Mount Lenses
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