TM 5-3610-257-14
(4)
Set FLASH UNITS dials at setting that is about 20% of normally used flash exposure (normal flash
exposure of 10 seconds, dials are set for 020 units or 2 seconds) for each exposure in making flash test.
(5)
Place a piece of film (approximately 10 to 12 in.) on vacuum back of camera.
NOTE
Do not expose film through lens unless flashing through lens.
(6)
Place halftone screen over film.
(7)
Cover film with a piece of black paper or cardboard except for about a 1 in. (25.4 mm) strip at top of
film.
(8)
Make a flash exposure (approximately 2 seconds).
(9)
Move paper or cardboard down an additional inch and expose again. Continue this procedure until at
least ten exposures are on film (first step exposed has an accumulated exposure of 200 units, last step has an exposure
of 020 units).
(10)
Develop film for a normal halftone exposure.
(11)
From negative, choose step that has desired shadow dot (should be same size dot as recorded when
determining basic screen range).
(12)
Determine proper setting of time unit dials by number of time units given desired shadow dot. For
example:
3-38
