Nikon 1988 Instruction Manual - Page 10

NOTES ON CLOSE-UP Camera shake When shooting close-ups, you will probably encounter some special problems not found in general photography. One is sensitivity to vibration-image magnification is so high that even the slightest movement 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 surfaces of the subject are in the same zone of sharpness. 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 ring 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 AND DUPLICATION WORK 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 bellows 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 extension value of the bellows attachment is calculated by the following equations: 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: