ZEISS lenses comply with challenging lens requirements. In order to ensure this constant high quality in R&D and production ZEISS has developed various sophisticated lens testing instruments. Based on decades of experience both economical and technical aspects were implemented in these instruments.
Optic manufacturers around the world work with these instruments in their production und labs.
The MTF-Tester K8 of ZEISS is a versatile and compact instrument for the measurement of the modulation transfer function of photographic lenses or similar systems at infinite object distance. The measurement is performed in real-time at three different spatial frequencies. The measurement is based on a line image analysis by means of a scanning slit system.
The ZEISS On-Axis MTF Tester K9 is a universal, modular designed equipment for measuring MTF on-axis at close distance. The MTF is determined for three spatial frequencies in real - time, applying line image analysis with a scanning slit system. Based on this principle important lens parameters as flange focal distance, accuracy of distance ring and focus shift can be measured precisely.
The ZEISS T-Stop Tester is a universal and modular designed test equipment for measuring apertures of photographic lenses. Since for the correct exposure of a film or an image sensor not the geometric aperture but the transmission corrected one is decisive, this equipment displays T-stop values. In order to ensure a simple and quick judging the measured values are displayed in exposure values (EV).
The distortion of a lens is a major criterion describing the performance of lenses in addition to the overall image quality. It is especially important in architectural photos or photogrammetry photos. The ZEISS distortion measurement device permits the radial distortion of lenses with an infinite object distance to be determined in compliance with the German standard DIN 58187. Furthermore, the focal length of the lens under test is measured precisely.