Nikon n65 User Manual download pdf (Page 104)

Glossary— continued

Focus Tracking

Enables the camera to analyze the speed of a moving subject according to the

focus data detected, and to obtain correct focus by anticipating the subject’s

position—at the exact moment of exposure.

Lock-On^“ Autofocus keeps focus firmly on a main subject during Focus Tracking

even if some other object momentarily blocks it in the viewfinder.

Focal length

The distance from the principal point to the focal point. In 35mm-format cameras,

lenses with a focal length of approx. 50mm are called normal or standard lenses.

Lenses with a focal length less than approx. 35mm are called wideangle lenses,

and lenses with a focal length more than approx. 85mm are called telephoto

lenses. Lenses which allow the user to continuously vary the focal length without

changing focus are called zoom lenses.

Front-Curtain Sync

The flash fires an instant after the front curtain of a focal plane shutter has

completed its travel across the film plane. This is the way the N65/N65QD operates

with the flash sync mode at Normal Sync. (See “Rear-Curtain Sync”.)

Guide number

The guide number indicates the power of a flash in relation to ISO film speed.

Guide numbers are quoted in either meters or feet. Guide numbers are used to

calculate the f/stop for correct exposure as follows:

guide number

f/stop =-------------------

---------------

flash-to-subject distance

Using a selected aperture, we can calculate the required flash-to-subject distance

with the formula:

guide number

flash-to-subject distance =-----------------------

f/stop

Useful for determining the maximum flash-to-subject distance for flash

photography.

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Nikon n65 User Manual Page 104