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■ Reproduction Ratio
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The reproduction ratio is the ratio of the apparent size of an
object to its true size. If, for example, the image on the image
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sensor is one-third of actual size, the reproduction ratio is 1 : 3.
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If desired, the reproduction ratio can be selected using the
reproduction ratio indicator.
Es
Example: Using the Reproduction Ratio Indicator
To shoot at a reproduction ratio of 1 : 3, select manual focus
Sv
and rotate the focus ring until the focus distance mark aligns
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with the number "3" in the reproduction ratio indicator, then
move the camera forward or back until the subject is in focus.
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■ Close ups and Reproduction Work
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To prevent blur caused by camera shake, mount the camera
on a tripod and use a cable release or remote cord. Close ups
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are generally associated with extremely shallow field depths;
for greater depths of field, stop down the lens, choose longer
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exposure times, and position the camera so that the focal
plane is parallel to the portion of the subject you wish to
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photograph. When using a lens hood, be careful that the
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hood does not touch the subject.
■ Exposure Factor
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The lens f-number indicates the brightness of the subject at a
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focus distance of infinity; higher reproduction ratios result in
reduced subject brightness. The actual brightness is referred
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to as the "effective f-number", and the amount that exposure
compensation has to be raised to account for the loss in
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brightness as the "exposure factor".
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Id
16
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