Nikon AF-S 300mm f-2.8D IF-ED II - Manual (Page 14)

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To limit the range of autofocus (Fig. 2)
With AF operation, set the focusing limit switch according to the pre-determined
distance range for the subject(s) to reduce focusing time.
Usable cameras: F5, F4-Series, F100, F90X/N90s, F90-Series/N90, F80-Series/
N80-Series, F70-Series/N70, F65-Series/N65-Series,
Pronea 600i/6i, Pronea S, and D2H, D1-Series, and D100.
Focus lock
With autofocus operation, focus is locked while pressing the focus lock button.
Although the AF-Lock function can be set on both camera and lens, priority is given
to whichever is set first.
Usable cameras: F5, F4-Series, F100, F90X/N90s, F90-Series/N90, F80-Series/
N80-Series, F70-Series/N70, F65-Series/N65-Series,
Pronea 600i/6i, Pronea S, and D2H, D1-Series, and D100.
•The position of the focus lock button on this lens can be modified. For information,
please contact an authorized Nikon dealer or service center.
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/22.
1 Set the lens to its minimum aperture (f/22) 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.
Infinity ( ∞) to close (2.3m)
(7.5 ft.)
Focusing limit zones provided
FULL 8 - 2.3m ∞ - 6m
Focusing
distance 8m (26.2 ft.) to close
(2.3m) (7.5 ft.) Infinity ( ∞) to 6m
(19.7 ft.)