32
EXPOSURE COMPENSATION ADJUSTMENT-continued
Original
Type of
film
Repro-copying & slide-copying
Photo-
microg-
raphy
B&W
color photo
Letters or
figures on
light
background
Letters or
figures on
dark
background
Panchromatic
film for general
use
No
compensa-
tion
necessary
+1 1/2 stops
- 1/2 stop
+1 stop
Ad justments for Film Compensation
Some exposure correction may be necessary when certain
types of films are used for copying or photomicrography ap-
plications; the amount of correction required, however, will
depend on the type of film and the specific application. The
following table lists the exposure corrections in Estops re-
quired 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 ad-
justing the ASA film-speed index ring. In the example shown,
the index ring is set so that the red mark is aligned with ASA
50; this setting is the correct position to achieve a one-stop
increase in exposure (three scale graduations equal one stop)
as required when performing photomicrography (see table)
using ASA 100 Panchromatic film.
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