Hoya HD Filter UV 82mm Y500137 Manuale Utente

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Y500137
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Why Coated?
There are three main reasons why filters should be coated. First, coating
enhances light transmission, second, it protects the surface of the filter
and third, it removes ghosting and flare, particularly between the rear of
a filter and the surface of a lens. In general, light transmission increases
as more layers of coating are applied.
Within these four groups, we offer a choice of grades with different 
coatings as follows:
STANDARD
These filters offer both amateur and professional photographers HOYA's
famous quality at reasonable prices. They have coatings applied to both
surfaces to suppress reflection and increase light transmission. There are
a few exceptions in the special effects range which, due to the special
materials used in construction, do not have coatings applied.
HMC (HOYA MULTI COATED)
These popular filters are renowned for their ability to minimise reflection
at the filter surfaces which reduces flare and ghosting. The result is an
average light transmission of over 97%, giving sharp contrast and well
balanced color. HOYA HMC filters are recommended for enhancing the
performance of today's multicoated lenses.
PRO1 DIGITAL FILTERS
Newly formulated multi-coating for digital camera CCD or CMOS
sensor.  These image capture devices are highly susceptible to
reflections - this stray light can ruin your photographs!  Don't risk your
valuable photos by using bare-glass filters.
HD FILTERS
Newly developed industry leading 8-layer multi-coating yields an 
average light transmission rate of 99.35% between 400 and 700nm 
(visible spectrum).  These coatings greatly reduce reflections off the 
surface of the glass allowing you to capture more light in your photos.  
As with all HOYA multi-coatings, HD HMC is applied in a furnace at high
heat, bonding the coating to the surface of the glass.  This process is
called "hard coating" and it is far more durable than other coating 
techniques. The chemistry of the top layer is formulated not just to be
more durable but to be resistant to oil stains.  This means that finger
prints and other oils are much easier to remove. 
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