Colour negative copying device, esp. enlarger - determines light intensity of three colour components for correct copying

摘要

The device determines the required colour correction and exposure, and has colour filters in the light path and a photocell responding to light intensity, followed by an indicator based on the principle of matching the copying light intensity for the three colour components. Two swingable levers (5, 8) are provided in an annular case (1) with a hole (2). They are, in their initial position, retracted into the case, leaving the hole free. The first (5) carries a photocell (6) which, in its operating position, lies in the hole axis. The second lever (8) is arc-shaped and holds colour filters (11) at the same distances from the lever axis of rotation. It passes them consecutively over the photocell.