Mike,
You may want to check your other polarizers; mine only one piece of glass
that is set into a ring that allows it to rotate. Makes sense...if you had
two polarizing filters it would go black when thay are at right angles to
each other.
Charlie
On Sun, Oct 19, 2008 at 10:52 PM, <usher99@xxxxxxx> wrote:
>
> Finally able to find a rear 43mm pol for the Tamron 400/4. (10 buck
> snipe) It is a single piece of glass???? Every other pol, linear or
> otherwise, always had two. Must be a good reason to add the extra
> glass. I do have some pol film to put on the T28 or T32 for cross pol
> purposes but perhaps that is a suboptimal way to construct them. I
> could see that perhaps a quarter wave retarder might be in the second
> glass for a circular flavor but it struck me as very odd construction.
> It is a bit of a pain to use with no way to rotate it externally unlike
> the newer Tam 300/2.8 AF. Any ideas of the advantages of the usual two
> glass construction?
>
> Thanks,
> Mike
>
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