Nikon D1X - Manual (Page 184)

171
CUST
OM SETTINGS
AND O
THER MENUS—CUST
OM SETTINGS
Custom Setting 19: Aperture Control during Zoom
On lenses with a variable focal length (for example, Micro
Nikkor or zoom lenses), maximum aperture var ies with focal
length. This setting deter mines how such changes in the maxi-
mum aperture affect the f/-number specified by the user in
aperture-priority auto or manual exposure modes. By de-
fault, aper ture remains fixed at the specified f/-number while
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 aper ture 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 aper ture 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, aper ture will decrease to f/11, two steps from f/5.6,
the maximum value for this focal length.
OK
F19 Aperture Control
during Zoom
Fixed
Variable
CSM MENU
Description No. Option
Aperture does not vary with lens focal length.
Fixed
(default)
Variable
For more information on:
pg. 84 Exposure mode
Aperture varies with lens focal length.