52 PHOTOGRAPHIC FACTS AND FORMULAS 
Stop.— 
2.3 14 | 2.89 | 3.394 | 49 | 4.723 | 5.64 | 6.7 
w02s!|oasT Fe Fe 13 | 14 i rl 
19 | 38 | 16! | “8 49 | ‘eu | 256 
re 
Light.— 
Intense sunlight (inky-black shadows) .............. 0 
Bright sunlight (strong shadows) ...............0.. yy 
Paint shadow cast by sun... <2. 3. a bee ee 1 
Dall (no shadows) «625.65. 556 06 snes hee 1% 
Very dull (whole sky very dark) ......5... eee 2 
If sunlight falls over one shoulder, add 0; if straight across 
subject, add 1; if sun is ahead, add 2. When using back 
combination only of R. R. or symmetrical lens, add 2, unless 
actual f value of stop is known and used. 
LiGHT VALUES FoR VARIOUS LATITUDES.—The following 
tables show the value of the light for each hour of the day 
and month for various latitudes and are calculated for use 
with the American Photography Exposure Tables. 
For 60° N.; Southern Siberia, Southern Alaska, Northern 
Canada, Iceland, Norway, Sweden, and Northern Russia. 
1 A og May Apr. Mar. Feb. Jan. 
MM June July Aug. Sept: Oct. “Nov: Wee: 
12 0 0 hea | 1% 2 3 
Bree 0 y% 1 bear 3 5 
Oe y y% 1 1% 2 ~ 6 
SAAS: y% 1 1% 2 3 s, 
8 4 1 1% 2 2 5 
“bans wy 2 3 5 
B06 2 3 > 
SE 5 5 
4 8 > 
Dec. Nov. Oct. Sept. Aug. July jae 
Jan. Feb. Mar.:. Apr: Mia 
ee 
