| 摘要 |
A camera having a copyboard for support of copy material pivotally mounted before the lens for viewing through the ground glass back for adjustment of focus and positioning of the copy material, has the copyboard pivotally mounted for return to a horizontal position in which the copy is generally supplied, and for improvement herein, the copyboard in vertical position is first centered and focused before the camera without copy material, and has a means for projecting an image of a guiding template upon the surface of the copyboard in horizontal position to project lines thereon serving as a guide for positioning of the copy material, whereby the copyboard and adjusted copy therein according to the projected guide lines, is already in focus when pivotally returned to vertical photographing position, so that the copyboard and supported copy therein needs merely to be photographed without further adjustment of position, with very substantial saving of photographic work of the operator to achieve and positioning of the copy material. In another aspect the template may have radial lines angularly disposed through the center, each projected at a copy guide angle upon the surface of the copyboard, provide a guide for rotation of the copy material according to the angular position needed for photographing to reproduce the copy in color, each guide angle corresponding to the necessary angular set of the copy material needed for a particular color. The copyboard with the radial guide lines projected on its surface portion, provide a guide for positioning of the copy material at the selected color angle for each color, so that the copyboard with the angularly set copy therein is then positioned by pivotal movement to vertical position before the camera to photograph the copy directly through a half-tone screen for the selected angular color, without need for further positioning or focusing of the copy or copyboard through the ground glass. The copy material is then photographed in a series, for each color, returning to the horizontal position for rotation again to the next color angle provided by the projected guide lines, and again returned on its pivot to photographic position before the camera, thus photographing, the copy in the series of angular positions for each color, without need for adjustment of or other positioning focus throughout the series, following the first presetting of the camera in focus.
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