The lenses must endure the effects of shocks, vibrations and large tolerance ranges for temperature and humidity.
With the stress tests, the environmental lab ensures the quality, durability and long service life that are valued by ZEISS customers around the world, says Udo Schellenbach, Sales Manager at Carl Zeiss. After all, in industrial use the optics are frequently exposed to permanent vibrations, e.g. from the machines.
Passing the test
The test engineers developed a more rugged test specifically for the ZF-I lenses. A Makro-Planar T 2/100 ZF-I equipped with fixing screws for focus and aperture was used for the test. This test was intended to check the durability of the lens against vibrations that are both longer and harder than usual. Instead of the standard half hour per axis, the lens was now subjected to a full 12 hours of random vibrations. The acceleration was 2.03 g instead of 1.6 g. The focus of the lens, and the optical performance here the modulation transfer function, MTF were measured before and after the test to determine usability in practice.Even after hours of vibrations, there was no verifi- able change to the back focal distance. The optical elements of the lens remained stable in their position and the focus was also unaffected in its one-time setting despite the multiple amplified vibrations.
Stress parameters in the environmental lab
All standard tests comply with the DIN ISO 9022 and SPA 10.003 standards. The lenses must withstand the following tests
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