CHAPTER 8 HOW NEW TECH CHANGES PHOTOGRAPHY^137
When the photographer turns on the camera—or when a manual
choice on the camera’s LCD screen is selected—the camera’s
oscillation circuitrysends a tiny electrical current to a
transformer. The transformer amplifies the strength of the current
from 9 volts to 50–100 volts and shoots the electrical current through
the filter’s frame.3
Retaining clips hold the filter tight against a gasket that prevents dust
getting between the filter and the image sensor. Particles of dust that
the sensor would have attracted accumulate, instead, on the filter.2
The electrical charge causes the filter
to vibrate at a rate of 350,000 times
a second for about a second and
a half.4
Dust that has built up on the filter is
shaken loose by the vibrations and
collected by an adhesive strip the
way flypaper traps flies. The strip is
replaced during regular cleanings of
the camera.5