New Series of Lenses for 16-Mm Cameras
The Eastman Kodak Company has recently announced a matched series of high-grade interchangeable lenses for 16-mm motion picture cameras, to be known as Kodak Ciné Ektar lenses. There are six focal lengths, from 15 to 152 mm, in geometrical progression with a common ratio of about 1.6. Relative apertures are unusually high, from f/1.4 for the 25-mm lens to f/4.0 for the 152-mm lens. The mechanical back focus in all cases has been designed to be greater than 12.7 mm to allow space for a reflex finder and a camera turret. — The reasons underlying the choice of formula for each lens are discussed, with particular reference to aperture and angular field. The definition in all cases is remarkably good over the entire frame, even at the maximum aperture. The lens barrels are large for convenience but light in weight, and the diaphragm scales are uniformly spaced. Unusually complete and equally spaced focus scales have been adopted for increased convenience in use. All glass-air surfaces are hard-coated, and the lens barrels are baffled to give the maximum image contrast and freedom from flare. The lenses can be fitted to any 16-mm camera by means of suitable adapters.
- Print ISSN
- 0097-5834
- Published
- 1949-05
- Content type
- Original Research
- DOI
- 10.5594/J12487