Nikon F25B manual Exposure Measurement

EXPOSURE MEASUREMENT

The exposure meter of the Nikon F2SB Ph otomic camera's finder features a center-weighted TT L metering system coupled to the shutter speed and aperture con- trols. Th e meter reads the light over the entire focusing screen but favors the central 12mm-diameter area . This allows you to make precise readings of the se lected sub- ject area, and results in more balanced overall ex posures.

-Underexposure"by more than 1 stop

0- Underexposure by 1/5 to 1 stop

0 Correct exposure

Determining Exposure

The finder has three LED exposure indicators visible within the viewfield ("+" for overexposure, " 0 " for correct exposure, and " - " for und erex posure); thus, the metering system is capab le of providing easy-to-read ex- posure information in f ive steps, and even at extremely low- Iight leve ls. Add itionaliy, the se lected shu tter speed and lens aperture settings are visible for maximum ease of operat io n for setting the desired exposure.

To determine the correct exposure with the Nikon F2SB: Switch ON the meter by moving t he fi lm -adva nce lever to the 20° standoff position; with this action, one of the LED indicators will light, indicating overexposure, cor- rect exposure or underexposure. If the plus (+) indicator Iights, increase the shutter speed or decrease the aperture until the center (0) indicator just comes on a nd the (+) turns off; if the minus (- ) indicator is lit, decrease the shutter speed or increase the a perture until the center in- dicator lights. Wh en two LEOs light simul ta neous ly (i.e.,

+ 0

Overex posu re by 1/5 to 1 stop

+ and 0, or - and 0). the exposure setti ng is within l -stop

of correct expos ure; thus, be sure to adjust the aperture

setting slow ly to get o nly the correct "center" (0) ex-

+ Overexposure by more than 1 stop

posure. Va lu es for the five sett ings of the LEO s are

described in the figure o n this page .

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