The Carl Zeiss Distagon T* 2,8/21 ZE 21mm f/2.8 Lens For Canon  is a super wide-angle lens and is the leader in its range.Its non-reflecting and virtually distortion-free, it will create spectacular compositions full of variety, dramatic contrast and deep, vivid colours.
The Zeiss Distagon T* f/2.8 21mm ZE Lens for Canon EF Mount EOS DSLR cameras is a precision wide angle lens built with a Carl Zeiss T* anti-reflection coating that yields accurate color and professional-quality, high contrast images without any color fringes. It delivers exceptional results under all lighting conditions. With close focusing of only 0.22 m it is useful for landscape photography and other subjects with dramatic perspectives. The Distagon T* f/2.8 21mm comes with an EF bayonet (ZE) mount for Canon film and digital full-frame SLRS. The large front filter diameter (82mm) allows for the use of standard screw-in filters when combined with a standard lens shade
Tamer of the infinite horizon
When the sky seems like it simply goes on forever, you can make the most of the moment with the Distagon T* 2,8/21. An expert at capturing spectacular landscapes and incredible scenes, it will make your compositions infinitely more dramatic.
When wide angle views go to extremes and beg the control via an SLR viewfinder, which means that the back focal distance has to be much larger than the focal length, a retrofous design called Distagon is the right choice.
Virtually distortion-free optics
Dramatic perspectives and a view from extraordinary image angles – SLR lenses from Carl Zeiss 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.
Elaborate stray light reduction
Rich, vibrant colors are vital to creating a lasting impression. Stray light in the lens, however, would lead to a brightening of the image, which is particularly visible in shadow areas. Image contrast is lowered; the image appears dull and bleached. We combine various, elaborate techniques to reduce unwanted stray light. For example, all lens elements are coated with the famous Carl Zeiss T* anti-reflective coating. Additionally, a jet black special paint is applied by hand to all lens element edges to ensure that reflections are prevented from the start.
Floating Elements Design
Today’s camera technologies and high-resolution sensors demand continuous improvement of lens performance. Thanks to the use of the latest floating element design principles, optical aberration effects in ZEISS lenses are reduced to a minimum throughout their entire focusing range. This is achieved by variation of the axial distance between individual lens elements or groups. This adjustment of the lens-to-lens distance is coupled to the distance setting to ensure correct compensation at all times. The mechanical construction of these lenses is extremely complex and they must be assembled with utmost precision – both of which are key competencies of ZEISS.
Excellent image quality
The Carl Zeiss range of 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.
Precise manual focus
Manually focusing a lens means controlling the image result from your fingertips. A good ergonomic design makes all the difference. Carl Zeiss SLR lenses stand out with their large rotation angle which enables 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. The precise engraving in meter and feet, and the depth of focus scale provide additional support for manually focusing.