Dx code, Exposure compensation – Nikon Camera N90 User Manual
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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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