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F stop numbers4/5/2023 Some Kodak cameras with simple lenses had a simplified aperture scale 1-2-3-4, meaning (estimated) U.S. Lenses are typically specified with their maximum aperture ability. For example the popular Kodak Anastigmat f7.7 (f-stop) was sold together with shutters with max. f-number (/) or Aperture/Iris Size how much light or heat a Camera Lens provides to thermal or visible sensor An fnumber (/) or fstop refers to the ratio of a lens’s focal length to its aperture’s diameter and indicates the amount of light coming through the lens. The Unified System (U.S.) diaphragm numbers can be found on many U.S.-made leaf shutters made between 18, whilst the speed of U.S.-made lenses could have been documented as f-stop value.
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