A quick perusal of wikipedia reveals that polarizing glass is quite
possible using deposited coatings similar to the anti-reflection ones.
Use of a polarizing film sandwich is just relatively cheap.
It does raise the question, how many here have had a UV filter go bad
on them? Not for me, but I am a fairly recent convert and keep my
camera equipment inside when it is not being used.
Winsor
Long Beach, California, USA
On / January 4, 2008 CE, at 7:27 AM, Bill Pearce wrote:
> Here's how it was explained to me. Polarizing filters are made by
> sandwiching a layer of plastic polarizing material between two thin
> pieces
> of glass, as it is impossible to make polarizing glass. The sandwich
> delaminates over time, a process accelerated by heat and humidity. The
> Kaesemann filter adds an extra step to the manufacturing and the
> cost by
> sealing the edge in some special way.
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