On 3 Dec 99, at 8:59, Dave Bulger spoke about "[OM] Wide angle lenses &
vignetting," saying
...
> If I throw away the lens shade, buy a 72mm polarizer and use a step-
up
> ring, will the 19mm vignette? I got a cheap 72mm polarizer from the
> OlympusGuy for my 300 that isn't marked as to linear or circular, but for
> the price I've got to assume it's linear. Is there any way to check short
> of underexposing film?
...
Sure. A "circular" polariser consists of a polariser and depolariser
sandwiched, depolariser toward the camera.
Look thru the camera end towards a shiny non-metallic object, rotate,
and the reflections wax and wane. Look thru the other side and there
is no change.
Tom
-----------------
From:Tom Trottier, 400 Slater St. Suite 415,Ottawa ON Canada K1R 7S7
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