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NOTE:
Generally, if a 1/2 shutter speed adjustment is indicated to negative film, a full stop should be taken.
When a reversal film is being used, disregard the half-stop setting and use a normal shutter speed.
8. Depth of Field
The area in acceptable sharpness in front of, and behind the subject in focus is called the depth of field. The
aperture selected and the distance of the subject as well as the focal length of a lens determines the depth of
field. Because of the long focal length of your lens, the depth of field is narrow. For example, with a 500mm f
6.3 lens, at a distance of 6 feet, the depth of field is only 1/2 inch wide. It is recommended that you practice
focusing with your lens before taking any serious pictures, especially in close up photography. Also, we
recommend using a focus magnifier to help determine the depth of field sharpness under extreme
conditions.
Summary of Contents for 500mm Mirror Lens
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Page 5: ... 3 500mm Mirror Lens 1 1 2 3 4 2 3 4 Focus Ring Distance Scale Index for Distance Macro Ratio ...
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