Hoya Y0667 Datasheet download pdf (Page 61)

The Value in a Hoya Multi-coated filter

Wide aperture professional lenses are very expensive, and all

photographers want to get the most speed, optical performance,

and dollar performance from their investment.

Look at it this way, a customer pays $800.00 for a 80-200mm f/2.8

lens. Then, to protect this investment the customer buys a cheap

bare glass filter, which has a light reflection rate of 10%. This filter is

literally slowing the lens down by 10% because that reflected light is

not getting to the lens, or effectively turning an $800 f/2.8 lens into

the equivalent of a slower f/3.0 lens with a corresponding value of

$720. The value of the lens, along with the light, drops 10% when

you put the cheap filter on it. The cost savings of the less expensive

filter do not off set the loss of lens speed.

Also, this does not address the possible loss of sharpness or focus

shift, which can have a detrimental impact on picture quality. For

these reasons, Hoya multi-coated filters present the best value in

filters available today.

Testing, 1, 2, 3…

Take a bare glass filter, hold it so that light reflection off the surface

can be seen. Then take a long very thin object like a pin or the tip

of a pen and hold it over the filter so that its reflection can be seen.

There will actually be two reflections of the pin on the surface, one a

little more pronounced than the other. The more pronounced reflection

is from the front surface and the lighter one is from light reflecting off the

rear surface. Now try it with a HOYA Multi-coated filter and see how

much more dim the reflection is, a dimmer reflection means less light is

reflected off the surface of the glass.

multi-coated

non-coated

mono-coated

IS CLEAR !

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Hoya Y0667 Datasheet Page 61