The use of electronics and electro-optic controls opens a new world of performance to optical systems and in particular to microscopists. We have achieved the electronic control of contrast, phase contrast and the generation of stereo (with a single objective at all numerical apertures)in standard commercial microscopes. In addition the ability to generate differential images opens up a completely new class of quantitative measurement. As new electronic techniques move out of the laboratory we can reasonably expect the performance of basic optical systems themselves to improve.

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