Hoya Y7POLC049 Fiche technique télécharger pdf (Page 51)

Hoya Coating and Multi-Coating,

the Quality Difference.

Hoya manufactures a full line of filters in both standard and Hoya

multi-coated. The difference between Hoya’s standard line and that

of other manufacturers is that Hoya standard filters have a layer of

anti-reflective coating bonded to each surface of the glass. Many

other manufacturers standard filters are bare glass, and bare glass

can reflect as much as 10% of the light hitting it. This greatly increases

the risks of flare and ghosting and reflections.

Hoya’s single layer coating decreases light reflection off the

surface from approx. 10% down to 4-5%.

Multi-Coating, Clearly Different

To provide photographers with a higher quality professionals require,

Hoya created the Multi-coated line of filters. These filters have a 3

layer coating system that further reduces light reflections off the

surfaces of the glass, the average is only 1-2%. This means that

98-99% of the light striking the filter is going through it, into the

camera lens and onto the film. These layers of anti-reflective

coating are bonded to the surface of the glass in a furnace at a

temperature of up to 800 degrees F, so there is never any chance of

the coatings coming off through normal use.

You should beware!

Some other manufacturers claim to have “coated” filters. But this

coating is often only applied to the front side of the glass, not both

sides like Hoya filters. Also, the coating on some filters is “painted” on

or applied as a cold spray that wares off or can even flake off easily.

Glass

Multi-coated

Light Ray

1 to 2%

Glass

Single Layer-coating

2 to 2.5%

Light Ray

Glass

Light Ray

4.5%

Total of 9%

NOT CREATED EQUAL!

2 to 2.5%

Total of 4 to 5%

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Hoya Y7POLC049 Fiche technique Page 51