Nikon 17-35mm-f-28D-ED-IF-AF-S-Zoom-Nikkor - Manual (Page 14)

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Reproduction Ratio and Shooting Distance
Normal focusing extends from infinity to 0.28m (approx. 0.9 ft.). A maximum
reproduction ratio of approx. 1:8.9 is obtained at the 17mm setting, while a
reproduction ratio of 1:4.6 is possible at 35mm.
Focusing, Zooming and Depth of Field
(Refer to Quick reference charts
1and 2 on page 57.)
In the M/A (autofocus with manual override) mode, first turn the zoom ring until the
desired composition is framed in the viewfindr 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.
It is possible to determine depth of field by using the scale provided on page 57.
To Use the Depth-of-Field Scale:
1 Cut out the scales along the lines indicated.
2 Place scale
2 over scale 1 so the top edge of scale 2 is aligned with the
focal length in use and the distance is aligned with the central indicator line
of scale
1.
3 Read the scale
2 numbers that correspond to the aperture in use. For example, if
the lens is prefocused at 1m with the focal length at 28mm and the aperture at
f/22, the depth of field will be approx. 0.6m to infinity.
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 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: