User manual

the largest stop in the single lens or the
second stop in the double lens :
bright sun outside, 4 seconds ;
hazy
sun, 10 seconds;
cloudy brig-ht, 20 seconds ;
cloudy dull, 40 seconds.
White walls, and only one window:
bright sun outside, 6 seconds;
hazy sun, ] 5 seconds ;
cloudy bright. 30 seconds;
cloudy dull, 60 seconds.
Medium-colored wall and hangings, and
more than one window;
bright sun outside, S seconds;
hazy sun. 20 second ;
cloudy
bright, 40 seconds;
cloudy dull, 80 seconds.
Medium-colored wall and hangin~ , and
only one window:
bright sun outside, 12 seconds;
hazy sun, 30 seconds;
cloudy bright, 60 seconds;
cloudy dull, 120 seconds.
Dark-colored wall and hangings, and
more than one window:
bright sun outside, 20 seconds;
hazy sun, 40 seconds;
cloudy bright, 80 seconds ;
cloudy dull,
2 minutes -lo seconds.