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| Subject | English | Russian |
| tech. | flange back distance | рабочий отрезок (объектива видеокамеры ADENYUR) |
| photo. | Flange Back Length | длина заднего фланца (It is the distance from the flange surface (contact point between camera and lens) and the focal lenght and is always fixed, depending on mount type. @ndreas) |