EXPOSURE COMPENSATION ADJUSTMENTS-continued

Adjustments for Film Compensation

Some exposure correction may be necessary when certain types of films are used for copying or photomicro- graphy applications; the amount of correction requ ired, however, will depend on the type of fi lm and the specific ap plication . The fol lowing table li sts the exposure corrections in f/stops required for various film/shooting requirements. Compensation is possible by adjusting the shutter speed or the aperture by the indicated amount; also, compensation is possible by adjusting the ASA fi lm -speed index ring. In the exa mpl e shown, the index ring is set so that the red mark is aligned with ASA 50; this sett ing is the correct position to achieve a one-stop increase in ex posure (three scale grad ua tions equ al one sto p) as requ ired wh en performing photomicrography (see table) using ASA 100 Panchromatic film.

I~

Repro-copying & slide-copying

 

 

B&W

Letters or figures letters or figures

Photo·

Type

micrography

on

on

color photo

 

offilm

light background

dark background

 

 

 

Panchromatic

No

+1 Y2 stops

- Y2 stop

+1 stop

film

compensation

for general use

necessary

 

 

 

32