working aperture造句

• Although he did not yet have access to Ernst Abbe's theory of stops and pupils, which was made widely available by Siegfried Czapski in 1893, Dallmeyer knew that his " working aperture " was not the same as the physical diameter of the aperture stop:
• The current line of Rodenstock enlarging lenses have removable click-stops for setting aperture in the dark, an illuminated f-stop display, and an aperture pre-set feature, which allows setting of the working aperture, and quick changing from full aperture to the working aperture, for easy focusing and framing.
• The current line of Rodenstock enlarging lenses have removable click-stops for setting aperture in the dark, an illuminated f-stop display, and an aperture pre-set feature, which allows setting of the working aperture, and quick changing from full aperture to the working aperture, for easy focusing and framing.
• Make a small round hole in the centre of the cardboard with a piercer, and now remove to a darkened room; apply a candle close to the hole, and observe the illuminated patch visible upon the front combination; the diameter of this circle, carefully measured, is the actual working aperture of the lens in question for the particular stop employed.