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Dx code, Exposure compensation – Nikon Camera N90 User Manual

Page 225

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DX code

Film information code printed on film cartridge. The N90, when

set to automatic film speed setting mode, senses the film

speed (ISO 25 to 5000) of DX-coded film when it is loaded.

EV

Exposure Value: A number representing the available

combinations of shutter speeds and apertures that give the
same exposure effect under conditions of similar scene

brightness and ISO.

At ISO

too,

the combination of a one-second shutter speed

and an aperture of f/1.4 is defined as EV1.

The camera may be used only within the EV range of the

exposure meter. For example, with the N90, the exposure

metering range is from EV -1 to EV21 for Matrix metering and

Center-Weighted metering, at ISO 100 with an f/1.4 lens.

Exposure compensation

Exposure compensation for available light is activated by

changing shutter speed and/or lens aperture— by Auto
exposure lock lever, by exposure compensation button or by

exposure bracketing.

In flash photography with a Nikon-dedicated TTL Speedlight,

exposure compensation can also be performed by varying the

amount of flash output.

Camera-originated exposure compensation affects both

foreground subject and background; variations in flash output
amount only affect foreground.

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