Exposure correction method

Details Exposure correction method Exposure correction method

1985-07-24

1987-02-17

Hayes, Monroe H.

Photocopying

Projection printing and copying cameras

Focus or magnification control

G03B 2734, G03B 2740

Patent

active

046435620

ABSTRACT:
Photographic printers are provided with a plurality of lenses with different magnifications. In order to change the size of the enlargement (or magnification of the enlargement), it is necessary for an operator to manually replace a lens or to select a suitable lens from among the plural lenses on a revolving lens turret by pressing a selector button. An exposure correction method is provided for a printer system in which lens units are selected such that when a lens unit is selected from among plural lens units having different focal lengths in accordance with a designated magnification, a conjugate length is calculated on the basis of the magnification and the focal length of the lens unit so as to select an optimum lens unit falling within the effective range of the system, and that the exposure is corrected on the basis of the relationship:

REFERENCES:
patent: 3832058 (1974-08-01), Gusovius
patent: 4140392 (1979-02-01), Lacombat et al.
patent: 4171904 (1979-10-01), Tani

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