The following table gives the approximate exposures under varying conditions of light when using stop f.16. If stop f.1 1 is used, give one-half the time ; with f.8 give one-fourth the time ; with stop f.6.3 give one-sixth the time : If stop f.22 is used give twice the time ; with stop f.32 give four times ; and if stop f.45 is used, give eight times the exposure given in the table. The smaller the stop the sharper the picture, see pages 244 or 21. Stop f.16 gives the best average results for interiors : White walls and more than one window : bright sun outside, 4 seconds ; hazy sun, 10 seconds ; cloudy bright, 30 seconds ; cloudy dull, 40 seconds. White walls and only one window: bright sun outside, 6 seconds ; hazy sun, 15 seconds; cloudy bright, 40 seconds ; cloudy dull, 60 seconds. Medium coloured walls and hangings and more than one window : bright sun outside, 8 seconds ; hazy sun, 20 seconds ; cloudy bright, 40 seconds ; cloudy dull, 80 seconds. Medium coloured walls and hangings and only one window : bright sun outside, 12 seconds ; hazy sun, 30 seconds ; cloudy bright, 60 seconds ; cloudy dull, 120 seconds. Dark coloured walls ami hangings and more than one window : bright sun outside, 20 seconds ; hazy sun, 40 seconds ; cloudy bright, 80 seconds ; cloudy dull, 2 minutes, 40 sees. (Messrs. Kodak, Ltd.)

Exposure Table

Exposures calculated for aperture f8 mid-day summer.