Custom Setting 19:Aperture Control during Zoom | | | | | | | |
On lenses with a variable focal length (for example, Micro | | | | | | | |
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Nikkor or zoom lenses), maximum aperture varies with focal | | F19 Aperture Control | | |
length. This setting determines how such changes in the maxi- | | | during Zoom | | |
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mum aperture affect the f/-number specified by the user in | | | Fixed | | OK | |
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aperture-priority auto or manual exposure modes. By de- | | | | |
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fault, aperture remains fixed at the specified f/-number while | | | | | | | |
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the lens is zoomed in or out. If desired, the camera can instead be set to vary the f/ -number with focal length so that aperture remains a fixed number of steps from the maximum setting. Suppose, for example, that a 70–210 mm, f/4–5.6 AF Zoom- Nikkor lens is mounted on the camera, and an aperture of f/8 is selected when the lens is zoomed out to 70 mm. At this zoom position, f/8 is two steps from the maximum aperture of f/4. Now imagine that the lens is zoomed in to 210 mm. If fixed aperture is selected, aperture will remain constant at f/8. If aperture is set to vary with focal length, however, aperture will decrease to f/11, two steps from f/5.6, the maximum value for this focal length.
Option | | No. | | Description |
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Fixed | | | | Aperture does not vary with lens focal length. |
(default) | | | |
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Variable | | | | Aperture varies with lens focal length. |
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For more information on:
pg. 84 Exposure mode
