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.

  • Features

    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. 

    Virtually distortion-free optics

    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* 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.

    Excellent resolution and high contrast

    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.

    Minimized Focus Shift

    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.

  • Data

    Lens Design

    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 Biogon T* 2,8/21 ZM - Lens Cut ZEISS Biogon T* 2,8/21 ZM - Lens

    Technical Specifications

    ZEISS Biogon T* 2,8/21 ZM

    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)

    *) Canon is a trademark or registered trademark of Canon Inc. and/or other members of the Canon Group. Nikon is a registered trademark of Nikon Corporation. Sony is a registered trademark of Sony Corporation. Fujifilm is a registered trademark of Fujifilm Corporation. Leica is a registered trademark of Leica Microsystems IR GmbH.

    **) Referring to 24x36 mm format

    ***) Referring to APS-C format

  • Pictures

    Your pictures made with our lens

    ZEISS Biogon T* 2,8/21 ZM

    Every day, thousands of impressive images are captured and every shot tells a different story, as you can see in these images below, all made with this ZEISS lens. The objective of the ZEISS Flickr Group is to gather the best of your images together and show them to the world.

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  • Accessories
    ZEISS Accessories - Filter

    Filter

    Accessories

    These filters feature T* ® anti-reflective coating and are optimal for protecting your front lens. The UV filters afford your pictures more brilliance, the POL filters reduce reflections on nonmetallic surfaces and increase color saturation.

    • High fitting accuracy for fast filter change
    • Can be used with a lens shade
    • Available in all standard sizes
    More details about the ZEISS T* UV and POL Filters
    ZEISS Accessories - Cleaning Products

    Cleaning Products

    Accessories

    From finger prints and grains of sand to the smallest particles of dust, dirty or scratched lenses compromise picture quality. It is essential that lenses are clean, and especially that they are properly maintained. ZEISS offers a range of professional cleaning products that perfectly complement your unique product experience. Our specialists have developed these products to meet the precise needs of high-quality optical surfaces.

    More details about the ZEISS Cleaning Products
    ZEISS Accessories - Camera Strap

    Camera Strap

    Accessories

    The ZEISS comfortable camera straps ensure that carrying your equipment does not lead to shoulder and neck strain, even when used for longer periods.

    More details about the ZEISS Camera Strap
  • Community

    Community Comments

    ZEISS Biogon T* 2,8/21 ZM

    Note:

    Our site is visited by people from around the world. To provide a common basis for discussion, we ask to write your comments in English. Observance of netiquette is for us a matter of course.


  • Awards & Reviews

    Reviews

    ZEISS Biogon T* 2,8/21 ZM

    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
  • Downloads
    Downloads: Brochure ZEISS Accessories for Rangefinder Cameras

    Brochure

    ZEISS Accessories for Rangefinder Cameras
    Downloads: Brochure ZEISS Camera Lenses Product Overview

    Brochure

    ZEISS Camera Lenses Product Overview
  • Registration
    ZEISS Product Registration - Photo Lenses

    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. 

    Register your product
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