| Popis: |
During the planning of the 35-mm. apparatus here described, the Department of Radiology was fortunate in having access to a 16-mm. unit assembled some ten years previously by engineers of the Eastman Kodak Co. under the supervision of Mr. Rex Willsey. Basically it consists of an f/0.81 cine lens of 4.1 cm. focal length made at the Eastman factory after a lens formula of B. Luboshez,2 and a Cine-Kodak Special camera with an unusually rapid pull-down or intermittent, which at normal camera speed moves the film into place in about one-fourth the time required by the conventional film shuttle. This Kodak experimental unit was designed primarily for ease and simplicity of operation. Recently the lens has been coated, and a Patterson B2 screen installed, increasing the photographic speed by more than 50 per cent. Probably no combination of this sort, using a refractor lens, requires less x-ray energy to expose the film. The new 35-mm. unit, while slightly inferior in photographic speed, embodies certain well tr... |
