FILTER TECHNOLOGY

Learn what the HOYA difference is and discover why HOYA Filters are the toughest filters on the planet.

Hoya Glass

We make our own glass. Hoya is the world’s largest optical glass manufacturer with more than 75 years experience in making optical glass. Hoya manufactures glass for optical filters, DSLR lenses, compact cameras, semiconductors and health care products such as eyeglasses and endoscopes.

Technologies

The Process – We carefully select the purest silicates and other raw materials for our glass. We precisely blend these materials in continuous automated furnaces for perfect consistency. We create more than 100 different types of glass everyday to ship worldwide. Hoya maintains a proprietary catalog of over 50,000 different methods for manufacturing glass. Our developers are constantly researching new methods and pioneering new formulas. Through experimentation they created HD3’s chemically, hardened optical glass.

The Polish – Hoya uses micron-precise polishing methods to ensure each filter’s surface is perfectly flat, parallel and smooth. This ensures that the filter does not degrade the quality of the lens optics.

The Coatings – We are pioneers in glass coating. We hold many patents on multi-coating glass processes. Hoya understands the value and necessity of using layers of antireflective chemical coatings to allow light to pass through the surface of the filter instead of being reflected. The percentage of light that passes through the surface of the glass is known as light transmission. Hoya’s expertise in coating technology allows us to create filters with light transmission rates approaching 100%. Light reflecting off the surface of the glass is the biggest cause of unwanted flare and ghosting. Hoya coatings are applied with heat so the antireflective chemicals are bonded to the surface of the glass in a process called Hard Coating.

HD3 Filters

These are the hardest antireflective coatings on the planet. HD3 filters have a total of 32 layers, 16 on each side making them 800% harder than normal optical coating. HD3 filters also have the best scratch and stain resistance on the planet and yield a light transmission rate of 99.7%.

EVO ANTISTATIC

The act of cleaning a filter with a cloth actually creates a static charge that attracts dust to the filter as soon as it’s done being cleaned. The EVO ANTISTATIC coating negates that static charge, meaning dust will not be attracted to the surface keeping it cleaner longer.   EVO ANTISTATIC filters have a total of 18 layers, 9 on each side that are twice as hard as normal optical coatings and are very easy to clean and keep clean. Evo antistatic filters yield an industry leading 99.8% light transmission rate.

HMC

Hoya pioneered the HMC multi-coated filter over 30 years ago. We update the 6 layer, 3 per side, multi-coating process as new chemical breakthroughs occur. Hoya HMC coatings yield a light transmission rate of 97.5%.

 

Aluminum Filter Frames

Our frames are lightweight and durable. We chose aluminum for its precise machining tolerances, while yielding many years of use. Aluminum also responds well to the high-pressure press technology Hoya uses to mount some of its filters eliminating the need for an additional retaining ring. This saves the customer money by not charging for more expensive and unnecessary metals. Hoya filter frames are hard anodized with a semi-mat finish to further reduce the chance of any flare or reflections.

UV Absorption Packaging

The specialized plastics used the Hoya filter packages have UV absorption properties to further protect the filter for long periods of storage.

Quality Control

Every step of the manufacturing process is closely monitored to exacting standards and micron-unit tolerance before the HOYA name goes on it. The final inspection happens just before the filter goes into the package and if at any point a piece of filter glass, coatings or filter frames fail to meet Hoya’s precise standards it is rejected immediately. Hoya controls the process from raw silicates to package product to ensure the best performance for photographers worldwide.