Abstract
In order to perform time-resolved photography of long sparks on a strip of film placed inside a flywheel rim, an optical system has been devised based on a nearly concentric mirror-pair similar to that used in a conventional reflecting microscope. A field-flattening lens is used together with two lenses to correct the chromatic defects introduced by the field-flattener. The nominal aperture is f/1.85 with a focal length of 72 mm. Simultaneous photographs of the same discharge are shown taken by a f/4.5 quartz-rocksalt achromat and the system described above. These show the advantage to be gained by using the above system.
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