ZEISS Biogon T* 2.8/21 ZM

Widen your view of the world.

Experiment with different angles and form a unique view of the world with this fast, super-wide angle lens.

The Biogon T* 2,8/21 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 slim lens design is easy to grip and focus, and uses a standard 46 mm filter diameter similar to many of the other ZM lenses and allows filters to be interchanged between the lenses. The lens is rangefinder coupled for easy focusing and the optional 21 mm viewfinder is available for accurate image composition. The Biogon T* 2,8/21 ZM is suitable for many different wide-angle applications including reportage work, landscape and architectural photos.

ZEISS Biogon T* 2.8/21 ZM
ZEISS Biogon T* 2.8/21 ZM
ZEISS Biogon T* 2.8/21 ZM

Excellent image quality

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.

Smooth, precise focusing

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.

Ideal aperture properties

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. The ZM lenses feature ten aperture blades. The almost circular aperture helps to create a particularly harmonious effect in the out-of-focus areas of the picture (bokeh).

ZEISS T* anti-reflective coating

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.

Robust design

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.

Performance

Focal length

21 mm

Aperture range

f/2.8 – f/22

Camera Mount

Leica M-Mount* (ZM)

Format compatibility

Full Frame

Focusing range

0,50 m (19.69") – ∞

Free working distance

Angular field** (diag. horiz. vert.)

90° | 80° | 58°

Diameter of image field

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

Flange focal distance

Entrance pupil position (front of image plane)

Features

Autofocus

Image Stabilization

Physical

Filter thread

M46 x 0.75

Rotation angle of focusing ring

Diameter max.

Diameter of focusing ring

Length (with lens caps)

Length (without lens caps)

64 mm (2.52")

Weight

300 g (10.58 oz)

ZEISS Biogon T* 2.8/21 ZM ZEISS Biogon T* 2.8/21 ZM

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.

Biogon Design

ZEISS ZM Lenses

Brochure

ZEISS Camera Lenses Product Overview

Brochure

ZEISS Accessories for Rangefinder Cameras

Brochure

ZEISS Biogon T* 2.8/21 ZM

Datasheet

Reviews

diglloyd.com
"The Zeiss ZM 21mm f/2.8 Biogon is a relatively inexpensive, but strong performer in my brief field shooting..."
diglloyd.com

luminous-landscape.com
"In 2004 Carl Zeiss introduced the Zeiss Ikon ZM rangefinder camera and a range of lenses. These lenses, as with the ZM camera......"
luminous-landscape.com

Lens Accessories

Tailored to meet your requirements.

When taking pictures, an optimal image is not the only consideration. Capturing that special experience also plays a key role. With their reliable functions, camera lenses from ZEISS ensure that photographers can fully concentrate on the image and composition, and bring their creativity to life. In order to perfect this experience, ZEISS now offers accessories tailored to the requirements of demanding photographers.

Obtain the extended warranty

Product Registration

ZEISS grants a warranty period of two years from the date of purchase for all its photographic lenses. This may be extended to three years after registering with ZEISS Online Registration. Although the ZEISS extended warranty is already available in numerous countries, claims under warranty may only be made in the country in which the product was purchased. 

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