Enlargement lens mount

Details Enlargement lens mount Enlargement lens mount

1978-09-12

1980-06-17

Evans, F. L.

Optics: image projectors

Plural projection paths with single light source

350266, 353100, 354289, 362 26, G02B 702

Patent

active

042081025

ABSTRACT:
An enlargement system has a light guide mounted inside the lens mount to reflect light from inside the enlarger on to a stop-value scale. A light shut-off ring is positioned relative to the light guide to selectively allow or cut-off the passage of light. In a first position a cut away portion allows light from inside the enlarger to pass through the light guide and illuminate the scale. When the system is used for close-up photography, the shut-off ring is rotated to prevent light that enters through the scale into the light guide from propagating into the enlarger.

REFERENCES:
patent: 2504254 (1950-04-01), De Grave, Jr.
patent: 3185064 (1965-05-01), Armbruster et al.

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