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stop value
IT, dat.proc. Endwert m
opt. Blendenwert m (a measure of the light-gathering power of the aperture; the ratio of the focal length to the diameter of the largest entering parallel beam that can pass through the lens); Blendenzahl f (a measure of the light-gathering power of the aperture; the ratio of the focal length to the diameter of the largest entering parallel beam that can pass through the lens)
phys. Blendenwert m