Nikon 28-70mm-f-28D-ED-IF-AF-S-Zoom-Nikkor - Manual (Page 14)

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Focusing, Zooming and Depth of Field
In the M/A (autofocus with manual override) mode, first turn the zoom ring until the
desired composition is framed in the viewfinder before autofocusing. In the M
(manual focus) mode, focusing is possible at any focal length, but the longer the
focal length, the larger the image and the shallower the depth of field, making
focusing easier. 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.
Note: Due to the optical characteristics of this lens, when shooting at 1.4m (4.6 ft.) or closer,
the focal length changes slightly during zooming. Therefore, focus again after zooming
when the camera’s focus mode selector is set to other than C (Continuous Servo AF).
Infrared Compensation
When shooting black and white infrared film, it is necessary to make slight manual
compensation to the focused distance. With color infrared film, no compensation in
focus is needed. The two small white dots just to the left of the distance index line are
the infrared compensation indexes at 28mm and 50mm. To make the necessary
compensation, focus manually on the subject, then realign your focused distance
with the appropriate white dot. Then attach a red (R60) filter for infrared photography.
To determine the position of the infrared compensation index at all focal lengths, use
this chart:
Zoom setting Compensation from distance index line (on distance scale)
28mm 3.0mm (white dot)
35mm 2.2mm
50mm 1.3mm (white dot)
70mm 0.8mm
Minimum Aperture Lock (Fig. 2)
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 white dot on the lever aligns
with the orange dot.
To release the lock, slide the lever in the opposite direction.