THE PHOTOGRAPHIC EYE

Bright sunlight is best suited to
cheerful "ordinary life"
photographs . . . though it can be
used to suggest that ordinary life is
pretty strange. (Student photograph
by Dick Waghorne.)
114 The Photographic Eye
f/11. You have just doubled the
amount of light that would enter the
camera if you clicked the shutter.
Remember that increasing the aperture
by one "stop" always doubles the
size of the lens opening. (Also
remember that a lower number indicates
a larger opening.)
Now change the shutter speed to
250. Since 1/250 of a second is half
as much time as 1/125, the amount
of light reaching the film has just
been cut in half. So you're back at the
point of departure exposure again. In
other words, so far as the amount of
light is concerned, f/11 at 250 will
produce the same exposure as f/16 at
125.
These two settings will not produce
exactly the same photograph. Both