Nikon AF-S DX Micro- Nikkor 40mm f/2.8G Panduan Pengguna - Halaman 6

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Nikon AF-S DX Micro- Nikkor 40mm f/2.8G Panduan Pengguna

■ Reproduction Ratio

The reproduction ratio is the ratio of the apparent size of an

object to its true size. If, for example, the image on the image

sensor is one-third of actual size, the reproduction ratio is 1 : 3.

If desired, the reproduction ratio can be selected using the

reproduction ratio indicator.

Example: Using the Reproduction Ratio Indicator

To shoot at a reproduction ratio of 1 : 3, select manual focus

and rotate the focus ring until the focus distance mark aligns

with the number "3" in the reproduction ratio indicator, then

move the camera forward or back until the subject is in focus.

■ Close ups and Reproduction Work

To prevent blur caused by camera shake, mount the camera

on a tripod and use a cable release or remote cord. Close ups

are generally associated with extremely shallow field depths;

for greater depths of field, stop down the lens, choose longer

exposure times, and position the camera so that the focal

plane is parallel to the portion of the subject you wish to

photograph. When using a lens hood, be careful that the

hood does not touch the subject.

■ Exposure Factor

The lens f-number indicates the brightness of the subject at a

focus distance of infinity; higher reproduction ratios result in

reduced subject brightness. The actual brightness is referred

to as the "effective f-number", and the amount that exposure

compensation has to be raised to account for the loss in

brightness as the "exposure factor".