On 10/9/2010 6:43 PM, Eric Weir wrote:
On Oct 9, 2010, at 5:59 PM, Larry Colen wrote:
UV, and skylight filters are clear. They nominally block out UV light that
would focus differently than visible light, and expose film our of focus,
causing a slight blurriness. These days they mostly serve two purposes:
1) Protect the surface of the lens, being cheaper and easier to replace.
Would you want to use a polarizing filter the same way?
Polarizers are 1.) expensive, sometimes more expensive than the lens.
2.) they eat a lot of light between 2-3 stops if I remember correctly,
so no you wouldn't want to use the Polarizer to protect a lens, even if
protecting the lens was a good idea. There's some dispute about that as
well.
------------------------------------------------------------------------------------------
Eric Weir
Decatur, GA USA
eew...@bellsouth.net
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