Circular polarizers affect exposure readings if the meter is behind a
semi-silvered meter ala the LX. There were a number of other cameras,
(none from Pentax IIRC, however), that put the meter in the same place
and had the same problem. Autofocus systems made circular polarizers
much more important.
John Francis wrote:
I'm not sure the exposure meter is affected - I didn't think it
was necessary to use circular polarizers with early SLRs (which
had metering). I believe the requirement came in with auto-focus.
I'd already got part of the way to the suggested test - if I had
a second polarizer I had deduced how to use the pair of them,
back-to-back, to determine which was the correct orientation.
But I don't have a second polarizer, so I couldn't do the test.
Using the reflected image of the first polarizer was a brilliant
idea, and enabled me to discover that, of course, I had put the
glass back in the wrong way round. Murphy never sleeps.
On Mon, May 08, 2006 at 10:45:31AM +0200, Jostein wrote:
Here's another suggestion:
Since the light meter in the camera will be affected by the direction, why not
hold it up in front of the camera, rotate the filter and note the max. and min.
EV. Then reverse the filter and repeat. The filter direction that gives the
least difference between max. and min. EV should be the right way, shouldn't
it?
Jostein
Quoting Ann Sanfedele <[EMAIL PROTECTED]>:
Except that it isn't true... if you rotate the polarizer
with it facing in eitehr
direction you can give yourself a black eye
at least with my tiffin polartizer
ann
----------------------------------------------------------------
This message was sent using IMP, the Internet Messaging Program.
--
When you're worried or in doubt,
Run in circles, (scream and shout).
