Twenty Years of Development of High-Frequency Cameras

The high-frequency camera of the Zeiss-Ikon Company has behind it twenty years of development. The original model, designed by H. Lehmann, appeared in 1917 as the Ernemann high-frequency camera. The principle is based upon optical compensation, to which end a reflecting drum with exterior mirrors was employed as compensating element. Films were exposed at a frequency up to 500 pictures per second. — The new model, which appeared upon the market in 1930, likewise depends upon mirror compensation, except that instead of the exterior mirrors a reflector drum is supplied with mirrors on the inside according to the patents of Professor Thorner. — In this way an extraordinarily simple driving mechanism has been obtained, and a very compact form; with a capacity of approximately 60 meters of standard 35-mm, film, the size of the camera does not exceed the dimensions of a normal cine camera. The latest model permits an exposure frequency of about 1500 pictures per second. — The camera is suited for use in technical photography of all kinds. It can be equipped with intermediate lenses for close-ups or with a supplementary distance tube for distance exposures. For photographing micro high-frequency films a particular apparatus has been developed. — To evaluate the exposures, a time-marking device is used, in which a glow-lamp, controlled by an electric tuning-fork, produces time records on the film at periods of 1/1000 sec.

Print ISSN

0097-5834

Published

1938-02

Content type

Original Research

DOI

10.5594/J14698