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.
Technical Specifications Hoya PROND8. Filter size: 5.5 cm, Colour of product: Black
Features Hoya 0917. Filter size: 5.5 cm, Filter type: Neutral density camera filter. Quantity per pack: 1 pc(s). Product colour: Black
Release Date 27.06.2014
Product Weight 2.47 ounces
Manufacturer Part Number 0917
This discussion is intended to exchange information between customers. If your question answered within 48 hours, the answer gives you an expert of Dodax.