Especially for service and repair of lenses
The Carl Zeiss T-Stop Tester is an universal, modular designed test equipment for measuring apertures of photographic lenses.
Since for the correct exposure of a film 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 spectral weighting of the photosensor is approximated to the eye's sensitivity V (λ). To calibrate the tester a master lens with an exactly known aperture is used.
The design of the tester is based on years of experience in measuring apertures in laboratory and production. The tester is especially suitable for service and repair of lenses. |  Overview
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