Nikon AF-S NIKKOR 300mm f/4D IF-ED Lens - Manual (Page 14)

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Depth of Field
If your camera has a depth of field preview (stop-down) button or lever, depth of
field can be observed while looking through the camera viewfinder.
Minimum Aperture Lock (Fig. 3)
For programmed auto or shutter-priority auto exposure shooting, use the
minimum aperture lock lever to lock the lens aperture at f/32.
1 Set the lens to its minimum aperture (f/32) by aligning it with the aperture
index.
2 Slide the lock lever toward the aperture ring, so the two orange dots are
aligned.
To release the lock, slide the lever in the opposite direction.
Recommended Focusing Screens
Various interchangeable focusing screens are available for certain Nikon SLR
cameras to suit any picture-taking situation. The ones recommended for use
with this lens are:
Screen
Camera
F5+DP-30
G4 G3
G1
G2 H3
H4 H1
H2
B C D E
EC-B
EC-E
F J K L M P
R
S
T
U
F4+DP-20
F4+DA-20
F3
F5+DA-30
A
F6
• To limit the range of autofocus (for M/A mode usable cameras
only)
Move the focus limit switch ( Fig. 2 ) from FULL to
∞
-3m to reduce autofocus
time. This is useful when shooting subjects farther away than 3m (9.8 ft). Set
the switch to FULL when your subjects are closer than 3m.