Kodak Pro 14n User Guide - Page 221

Focal length Front-Curtain Sync Guide number Histogram ISO LCD Manual flash April 29, 2004 The distance from the principal point to the focal point. In 35 mm-format cameras, lenses with a focal length of approximately 50 mm are called normal or standard lenses. Lenses with a focal length less than approximately 35 mm are called wide angle lenses, and lenses with a focal length more than approximately 85 mm are called telephoto lenses. Lenses that allow the user to continuously vary the focal length without changing focus are called zoom lenses. The flash fires an instant after the front curtain of a focal plane shutter has completed its travel across the film plane. The camera operates this way with the flash sync mode at Normal Sync. See also "Rear-Curtain Sync." The guide number indicates the power of a flash in relation to ISO. Guide numbers, quoted in either meters or feet, are used to calculate the f/stop for correct exposure as follows: f/stop = guide number / flash-to-subject distance Using a selected aperture, we can calculate the required flash-to-subject distance with the formula: flash-to-subject distance = guide number / f-stop Use to determine the maximum flash-to-subject distance. The image histogram shows the range and distribution of tonal values for an image. The tick marks at the bottom of the histogram represent photographic stops relative to the factory-determined 18% gray level. The range of stops is from +3 to -7. The double bar tick mark indicates the exposure value associated with 18% gray. Tick marks to the right of the double mark indicate one-stop increments brighter than 18% gray, and tick marks to the left indicate one-stop increments darker than 18% gray. ISO is the international standard for representing film sensitivity. The higher the number, the greater the sensitivity, and vice versa. For example, ISO 200 is twice as sensitive as ISO 100, and half that of ISO 400. When you change the ISO setting on your camera, you adjust the sensitivity of the imager equivalent to the corresponding film sensitivity. Liquid Crystal Display. Your camera has four: the Top Status LCD panel, Back Status LCD panel, Image LCD panel, and the LCD inside the viewfinder. Flash output is controlled manually in manual flash mode, unlike in auto flash mode, where flash output power varies automatically according to the selected aperture. Some Speedlights, including the NIKON SB-28, SB-27, SB-26, SB-25, SB-24 and SB-20, provide selectable manual outputs (full, 1/2, 1/4, 1/8, 1/16, etc.), while others provide full manual output only. Glossary-3