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Abstract

Processes for the introduction, visualization and/or recording of a variable detail metering field stop into part ray paths of a camera for optical instruments, for example microscopes, are described. In addition, appropriate devices are specified. They contain a reversibly illuminable multifield matrix (4), which is provided, at a fixed location, in a plane which is conjugated with the eyepiece intermediate image plane of the optical instrument. The multifield matrix (4) is activated by a processor (22) in such a fashion that the transmission characteristics of the entire multifield matrix (4), or of at least one geometrical subregion of this matrix, are altered spontaneously reversibly, the following process steps being carried out: an object (3) is imaged on the multifield matrix (4); all fields of the multifield matrix (4) are cleared one after the other while simultaneously measuring the light passing through each cleared field; the measured values obtained are fed to a computer (23); the individual measured brightness signals are evaluated by the computer (23) and the measured values of those fields which feature object image structures are stored; all fields of the multifield matrix (4) which feature object image structures are cleared by the processor (22); the ideal exposure time is determined by the computer (23); the time values determined by the computer (23) are passed on to the camera shutter 7, which then carries out its function in a known fashion.

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First Claim