Tris, on their webpage, Hoya PROUDLY advertises that it's made from
aluminum, as it will absorb shock instead of transmit it like brass.
Albert
~~~~~~~~~ Quote from Hoya's website ~~~~~~~~
Hoya believes the filter frame is an extremely important part of the
filter as well. Hoya uses machined aluminum frames to hold their high
quality glass. They prefer aluminum to other materials because it is
strong enough to hold up to years of use. Some say that brass is the
best material to use, however, Hoya doesn’t hold that view and here is
why; brass is a far more rigid material than either aluminum or the
polycarbonates that are being use in today’s lens barrels. This means
that, should the front of the lens get hit, the rigid brass filter ring
will transfer almost all the force of the shock to the lens barrels and
mechanics. An aluminum filter frame will absorb some of the shock by
bending and at a certain point the glass will chip or break, which is
what the filter is supposed to do, protect the lens. Replacing a filter
is always preferable to getting a lens repaired.
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