Nikon AI-S Micro-NIKKOR 105mm f-2.8 - Manual (Page 17)

NOTES ON CLOSE-UP PHOTOGRAPHY AND DUPLICATION WORK
Camera shake
When shooting close-ups, you will probably en­
counter some special problems not found in general
photography. One is sensitivity to vibration-image
magnification is so high that even the slightest move­
ment during shooting will cause a blurred image. To
avoid this, we recommend the use of a tripod with a
cable release to activate the shutter. For this purpose,
the 360° rotatable tripod mounting collar on the PN
ring will prove useful.
Close working distances
At the high reproduction ratios of close-up shooting,
depth of field decreases drastically. Stopping down
the lens partially compensates for this, but at very
close working distances, an extremely shallow depth
of field is inevitable. Be sure, then, to place the
camera carefully to ensure that the important sur­
faces of the subject are in the same zone of sharp­
ness.
Close-Up photography with PN-11 ring
The Micro-Nikkor 105mm f/2.8 goes from a 1:2
reproduction ratio down to 1:0.88 when the PN-11
ting is attached. Because the Close-Range Correction
System is specifically designed for focusing at close
distances rather than at medium to infinity, the
apertures that will give you good results will be
10
limited when the PN-11 ring is used for reproduction
ratios from 1:2 to 1:1.1. The recommended f/number
scale engraved above the reproduction ratio scale
indicates best results.
Close-up photography with bellows
attachment
When using a bellows attachment, focus by turning
the lens focusing ring to a closer distance setting,
without lengthening the bellows extension. If bel­
lows extension is required for reproduction ratios
from 1:2.2 to 1:1, stop the lens down, referring
to the recommended f/number on the lens barrel.
• The lens should be focused to as close a distance as
possible for good results, even if the lens is used in
reverse position.
• For a predetermined reproduction ratio, the exten­
sion value of the bellows attachment is calculated
by the following equations:
j . .. bellows extension
reproduction ratio = ———------------------ ;--------------
focal length
A 1:2 reproduction ratio is achieved with the lens
set at its closest distance setting (with approx.
82mm focal length). If you want to shoot a subject
at 2X magnification (1:0.5 reproduction ratio), use
the following equation for the required bellows
extension: