Smooth and reliable autofocus

The design of the autofocus system demands an extremely precise movement of certain lens elements. As the mass of the elements or groups to be moved within the optical system differs, various motor types may be installed. The focusing system of the Touit lenses is designed to guarantee robust and smooth autofocusing without any need for compromises or limitations in their optical design.

Information: To achieve maximum compatibility on APS-C cameras of the Sony Alpha series with E-Mount (AF in video mode) we highly recommend using the latest Sony firmware.

1:1 Macro Capability

The ZEISS Touit 2.8/50M lets you capture the smallest things and the tiniest details at their actual size. At its closest focusing distance, subjects sized 15x23 mm fill the frame with an impressive maximum reproduction ratio of 1:1. The imaging performance of the ZEISS Touit 2.8/50M is just as exceptional at such short distances as it is at medium and long distances. Minimum distortion, outstanding correction of chromatic aberrations, minimal image field curvature and excellent correction of coma and astigmatism allow true-to-life reproduction of any subject, particularly in combination with the high resolving power of modern sensors.

Full compatibility

The ZEISS Touit lenses are designed and constructed specifically for use on APS-C cameras of the Sony Alpha series with E-Mount and Fujifilm X series. The lenses are therefore fully compatible and support all camera functions, including autofocus.

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

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.

Focal length

50 mm

Aperture range

f/2.8 – f/22

Camera mount

Sony E-Mount

Format compatibility

APS-C

Focusing range

0,15 m (6.02") – ∞

Free working distance

0,05 m (1.97 ″) – ∞

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

31° / 26° / 18°

Diameter of image field

28 mm (1.11")

Coverage at close range (MOD)

24 x 16 mm (0.93 x 0.61")

Image ratio at minimum object distance

1 : 1

Lens elements | groups

14 / 11

Flange focal distance

E: 18 mm (0.71")

Entrance pupil position (front of image plane)

67 mm (2.67")

Autofocus

+

Image Stabilization

–

Filter thread

M52 x 0.75

Rotation angle of focusing ring

720°

Diameter max.

E: 75 mm (2.95")

Diameter of focusing ring

E: 65 mm (2.56")

Length (with lens caps)

E: 104 mm (4.09")

Length (without lens caps)

E: 91 mm (3.58")

Weight

E: 290 g (0.64 lbs)