c. Keep the meter away from extreme heat. If it is heated above 120
degrees Fahrenheit for any appreciable length of time, the meter could be
In particular, a glove compartment on a warm sunny day
can ruin camera gear.
d. Keep the meter away from moisture. Water can short out the wiring,
and can also cause metal parts to corrode, affecting the smooth operation of
the mechanism. If you must use the meter in wet weather, seal it inside a
clear plastic bag.
e. Never point the sensor directly at the sun or any extremely bright
light source; this can easily damage it. In some cases, the damage isn't
permanent, and the sensor is only "blinded" for a while and will recover
after a few minutes or hours. Until it does, though, it won't be reliable.
In severe cases, the damage can be permanent.
f. If you don't plan to use the meter for an extended period of time
(two weeks is a common recommendation), remove the battery.
case could rupture and acid could leak out.
11. Summary of lesson.
By now you should know the theory of exposure,
what f/numbers are, how shutter speeds work to control exposure, how to find
equivalent exposures, how to get a usable exposure using the daylight
exposure table, and how to use a light meter. To find out how much you've
learned, answer the questions that follow, then check in the back of this
book to see how well you did.