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one or two f/stops to obtain the critical aperture of the lens for the sharpest image.) Make necessary exposure lens wide open, you can use the fastest shutter speed that conditions will allow. Thus you are better able to reduce image motion. use a slower shutter speed to get the required depth of field. This is not much of a problem because the photo "bird" (aircraft in which you are present) and the target, usually another plane, are flying at about the same speed and very little movement of the subject is apparent. You are flying. important before preflight, so you, the pilot, and the fulfill mission requirements. The facts and requirements for a mapping mission consist of the required scale of the photography and the area to be photographed. Using this information, you can make several calculations to determine such factors as flight lines, film requirements, and so forth. There are a number of methods and mathematical formulas that you can use to arrive at these conclusions. Through careful calculations, you can determine the following factors: photograph is taken from a low altitude. From a high altitude, a larger area is included, but each part of the at a low altitude, you should make a series of form one large photograph (a strip or a mosaic). By doing so, you can cover a large area and the objects on the ground are reproduced in a relatively large image size. problem are dependent upon other sections of the problem. An error made early in the calculations causes errors in the steps that follow. when only one frame is required to capture your subject, the IFGA formula should be used. For example, when should use the IFGA formula to determine the minimum altitude or distance that is required to fit the ship into focal length, and the size of the negative, you can determine the distance or altitude from the ship. When the aircraft must fly at a specified altitude, you can manual Photography (Basic), NAVEDTRA 12700, for step-by-step application of the IFGA formula. COMPUTER Advanced Photography Course |
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