With its fast and almost silent autofocus action, this lens developed especially for the Sony Alpha system as a standard prime lens (or moderate telephoto lens with APS-C sensors) always remains discreetly in the background.(1) In contrast, the Planar T* 1.4/50 ZA takes centre stage when it comes to optical performance. You can look forward to richly detailed and crystal-clear exposures with outstanding contrast, even in unfavourable light.
(1) Autofocus available only in combination with camera models that support SSM (e.g. Konica Minolta SLR cameras launched in 2001 or later, or all Sony Alpha models)
|Focal length||50 mm|
|Aperture range||f/1.4 – f/22
|Focusing range||0.45 m – ∞
|Number of elements/groups||8/5|
|Angular field (full frame)
|Angular field (APS-C)
|Filter thread||M 72 x 0.75|
|Dimensions (with caps)||ø 81 mm, length 91 mm|
|Weight (without caps)
Its metal barrel and bayonet as well as elaborate protection against dust and spray make the lens perfect for shooting in demanding outdoor conditions – and also guarantee its constant readiness for many years of intensive use.
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.
The aspherical lens design ensures consistent imaging performance throughout the entire focusing range as well as sharpness to the periphery of the image. The asphere's more complex surface profile can reduce or eliminate spherical aberration and also reduce other optical aberrations compared to a simple lens.
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.
Design of the autofocus system requires extremely accurate shifting of particular lens groups. While this is normally achieved via mechanical coupling from the camera body, ZA lenses feature a built-in SSM (Super Sonic wave Motor) focusing system for even more refined AF performance.