Each Hoya filter is the result of research, know-how and complete
precision facilities backed by full quality control. Before
production starts, controls are first programmed into a computer.
Then the finest materials are carefully mixed by an automatic
V-blender for absolute uniformity. After being melted with highly
sophisticated equipment, this material is then precision molded
with automatic direct pressing equipment. The pressed blanks are
next slowly and continuously cooled to remove strain, and are then
polished by high-speed, double-surface polishing machines that
assure precise surface quality and perfect flatness. Next is the
coating process which improves the filter light transmission
ability. And the transmission characteristics are checked by
Spectro-Photometer, after which an ultrasonic cleaner removes all
foreign matter from the surfaces. Only after passing all of Hoya's
quality tests are the filters assembled, finished and made ready
for shipment to customers throughout the world.
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