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Zeiss Ikon Diaphot, pocket-sized optical exposure meter, manufactured in Dresden in the 1920s–early 1930s.
Vintage instruction leaflet titled “Exposure-Meter DIAPHOT” showing a black-and-white illustration of a person holding a small circular exposure meter up to her eye. The text reads “How to use it!” and “Zeiss Ikon A.G. Dresden.” The paper shows visible creases and signs of age. (Source: the Internet, licence unknown, likely public domain)
Digital monochrome photograph of a round metal and glass exposure meter standing upright on a wooden surface. The device has a small hanging loop at the top, a dark glossy glass face with a star symbol and a crescent-shaped window with a gradual density, behind the glass a circular cutout. An exposure scale visible through a window near the top. The background is dark and softly blurred. (Photo by me, CC BY 4.0)