The Zeiss Touit 2.8/50 Macro 50mm f/2.8 Lens For Sony E Mount  is a moderate telephoto prime lens designed for use on cameras with APS-C format sensors and as such provides a 35mm-equivalent focal length of 75mm.
This lens is compatible with Sony E mirrorless cameras and supports all camera functions, including autofocus and exposure control. With a 1:1 magnification ratio, it offers close-up macro capability and its minimum focus distance is 6". An f/2.8 maximum aperture is effective in low light and provides shallow depth of field focus.
A complex floating lens system ensures a uniform length when focusing and provides consistently sharp performance. The optical design includes two aspherical elements and two anomalous partial dispersion elements which minimize lateral and longitudinal chromatic aberrations. Its nearly circular 9-blade diaphragm combined with depth of field control enables imaging with a soft, pleasing, out-of-focus background. It is an ideal lens for portraiture, still-life, landscape and numerous other photo and video applications.
The physical construction of the lens features a sleek, all black, metal lens barrel with rubberized control rings for smooth precision when working with manual focus. A metal bayonet mount ensures accurate alignment.
For optimum compatibility of Touit lenses on Sony NEX cameras it is recommend to use the latest firmware (1.02 for NEX-5R/NEX-6 and 1.03 for NEX-7 or higher). The firmware can be downloaded from the Sony website.
Sony E Compatibility
Designed for use on Sony E-mount APS-C mirrorless cameras, its 35mm focal length equivalence is 75mm. The lens offers complete compatibility with all camera functions, including accurate autofocus and exposure control. It features a wide f/2.8 maximum aperture for effective low-light shooting as well as greater control over the focus plane for shallow depth of field and selective focus applications.
A floating element design provides images with sharp delineation and means the lens does not extend during focus. The optical construction includes two aspherical elements and two anomalous partial dispersion elements to reduce chromatic aberrations and distortion.
A durable metal barrel with rubberized control rings provide improved handling. The metal bayonet mount ensures a solid connection between the camera and lens, and a nine-blade, nearly circular aperture is used to render soft, out-of-focus highlights.
When the angle of view becomes extreme, the retrofocus design of the Distagon lens can also be the ideal choice when the camera is not an SLR. Distagon lens types possess the low, image-sided, raypath angles that are particularly favourable for use with digital image sensors and also guarantee an extremely homogeneous distribution of brightness across the image field.
Innovative product design
Innovative product design to ensure superior handling and fulfil the most stringent aesthetic expectations. Zeiss lenses are among the winners of the several thousand products entered for prominent design awards. The unmistakeable new product design is based on an integrative concept and focuses on essential functional elements. Even the lens hood, typically an accessory, is seamlessly integrated into the overall design. The metal bayonet mount guarantees extreme rigidity and rubberised setting rings enable precise manual control when needed. Flush-fitting, satinised surfaces visualise the optical and mechanical precision of each lens.
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.
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 resolution and high contrast
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.
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.