The viewed image is neither inverted nor reversed. The direct-optical viewfinder most commonly used, the bright-line viewfinder, is essentially an inverted Galilean telescope system with an optically projected rectangle outlining the frame area. The focusing mechanism of the viewfinder regulates the main lens as well. The image is not inverted but is laterally reversed. In a twin-lens reflex camera, the finder has a lens of its own, essentially a duplicate of the aperture lens, placed above it and reflecting the image by a mirror to a ground-glass screen. The sighting devices in cameras lacking screens are called viewfinders they show how much of the scene will appear on. SpaceNext50 Britannica presents SpaceNext50, From the race to the Moon to space stewardship, we explore a wide range of subjects that feed our curiosity about space!.Learn about the major environmental problems facing our planet and what can be done about them! Saving Earth Britannica Presents Earth’s To-Do List for the 21st Century.Britannica Beyond We’ve created a new place where questions are at the center of learning.100 Women Britannica celebrates the centennial of the Nineteenth Amendment, highlighting suffragists and history-making politicians.COVID-19 Portal While this global health crisis continues to evolve, it can be useful to look to past pandemics to better understand how to respond today. ![]()
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