Nikon PhotomicF Tn Finder Manual de instrucciones - Página 20

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EXPOSURE CORRECTION

index ring is set opposite the film speed dial. If exposure correction is required, line up the proper marking opposite

the number corresponding to the film speed. For example, the table indicates a half-stop decrease (-1/2) for the

135mm f/3.5 lens with Type C screen. If the film speed is ASA 100, 1ine up the number 100 on the film speed dial

opposite—1/2 mark. When no exposure correction (0) is indicated, the ASA rating for the film m use should appear

opposite the red triangular index.

- Measure exposure by the full-aperture method.

- Use the stop-down measuring method.

- Neither method will work. With these lens-screen combinations the viewfinder can be used only for focusing,

not exposure measurement.

Combinations represented by a blank space are unusable because of image darkening or considerable moire over the

screen area.

Special Lens-Focusing Screen Combinations

Because the light-transmitting properties of some focusing screens differ from those

of ordinary screens, certain lensscreen combinations require exposure correction to

compensate for the influence of the screen. Compensating marks from -2 to +1/2

are engraved around the ASA film speed dial. Correct settings are given in the table

at right.

The numbers in the table indicate the exposure corrections to be made in f/stops:

this means you have to stop down or open up the lens diaphragm according to the

indicated numbers. With the Photomic FTN meter, however, exposure compensa-

tion is automatic at all aperture settings when the proper mark on the ASA scale