Bedienungsanleitung Nikon F75 (Seite 62 von 67) (Englisch)

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MISCELLANEOUS

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.

Metering system

See the column on page 32.

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.

The F75/F75D’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 Portrait 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

Flexible Program

Flexible Program function temporarily shifts an

automatically selected shutter speed/aperture

combination while maintaining correct exposure.

That is, the desired shutter speed or aperture can

be selected in Auto-Multi Program.

f-number

The f-number represents the aperture value and is

calculated from lens’ focal length divided by the

effective aperture opening. The standard numbers

for calibration are 1, 1.4, 2, 2.8, 4, 5.6, 8, 11, 16,

22, 32, etc.

The smallest f-number is called maximum aperture

and the largest f-number is called minimum

aperture. Lenses with large maximum apertures

(smaller f-numbers) are ‘fast’ lenses that allow

photographers to use faster shutter speeds in dim

light. Lenses with smaller maximum apertures

(larger f-numbers) allow the use of lower shutter

speeds for available light but are also lighter and

smaller than faster lenses. With some zoom lenses,

aperture varies depending on the focal length

setting.

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 F75/F75D

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. The guide number of the

built-in Speedlight of the F75/F75D is 12 (ISO 100,

m). Guide numbers are quoted in either metres 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

f l a s h - t o - s u b j e c t d i s t a n c e = ————————

f/stop

Useful for determining the maximum flash-to-

subject distance for flash photography.

122

F75 (En) 03.1.23 11:10 AM Page 122

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