Manual Nikon F65D (page 53 of 59) (English)

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MISCELLANEOUS

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.

Focus Tracking

Enables the camera to analyse 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.

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 F65/F65D 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.

ISO film speed

The international standard for representing film sensitivity. The higher the number,

the greater the sensitivity, and vice versa. A film speed of ISO 200 is twice as

sensitive as ISO 100, and half that of ISO 400 film.

Rear-Curtain Sync

Flash fires an instant before the second (rear) curtain of the focal plane shutter

begins to move. When slow shutter speeds are used, this feature can create a blur

effect from the ambient light, i.e., flowing-light patterns following a moving subject

with subject movement frozen at the end of the light flow. (See “Front-Curtain

Sync”.)

Slow Sync

A flash technique for using the flash at a slow shutter speed. Flash shooting in dim

light or at night at a fast shutter speed often results in a flash-illuminated subject

against a dark background. Using a slower shutter speed with the flash brings out

the background details in the picture. Use of a slow shutter speed with Rear-

Curtain Sync is particularly effective for illustrating the movement of a stream of

light.

The F65/F65D’s Slow Sync mode extends the automatically controlled shutter

speed range down to 30 sec. (in Auto-Multi Program, Aperture-Priority Auto) or 1

sec. (in h Night Scene mode).

Vignetting

Progressively diminished illumination on the film from the centre to the corners.

There are two kinds of vignetting—natural vignetting caused by the lens, and

vignetting that is caused by improper use of accessories such as a lens hood or

filter.

Glossary—continued

F65 (E) 02.12.27 5:43 PM Page 104

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Nikon F65D Manual

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