Mamiya RZ67 PRO II Instructions Manual

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Mamiya RZ67 PRO II Instructions Manual Manual pdf 37 page image

Close-up PhotographyExposure Compensation for Close-up Photography35When working very close to the subject, the exposure must be in-creased. The actual exposure factor will vary in accordance with the dis-tance that the lens is extended. (Optical law: Light intensity decreases bythe square of the distance from the film plane).Exposure compensation is easily determined by referring to the Expo-sure Compensation Scale.After focusing the lens, read the exposure compensation factor on thescale. The scale is divided into three zones of light, medium, and darkshades. As indicated by the table at the base of the scale, the light zonerepresents an exposure factor of zero (no compensation is necessary),the medium shaded zone indicates +0.5 (a 1/2 stop increase in exposureis required), while the dark zone denotes a factor of +1 (a full stopincrease in exposure is necessary).To find the exposure factor, first locate the figure on the Focal LengthScale for the lens in use. Next, move along the scale, in the samecolumn, until you reach the Distance Graduation. The shading of thezone (light, medium, dark) which touches the Distance Graduationindicates the correct exposure factor. For example, when the 110mm lensis focused as shown in the illustration, the correct exposure factor is +1.The scale curve for each lens has a white O mark which coincides withthe right-hand lens indication. So, use the mark to find the correspondingscale curve for each lens.With a factor of +0.5, open the aperture by a half-stop. For example,assume that a hand-held exposure meter indicates a normal exposurereading of f /16 at 1/60 sec., for an exposure compensation of +1, set thelens to either f /16 at 1/30 sec. or f/11 at 1/60 sec.When using a Mamiya through-the-lens (TTL) Exposure Meter Finder,such as the RZ AE Prism Finder, it corrects automatically for close-upphotography.• For optimum sharpness at the corners when using the 50 mm and65mm wide-angle lenses at distances closer than 1 meter, use as smallan aperture as possible.• The bellows extension in millimeters appears on the top of the FocalLength Scale. These figures are used to determine the requiredexposure compensation factor when using extension tubes.• For areas covered with the bellows fully extended, see the instructionsfor all interchangeable lenses.