Olympus-OM
[Top] [All Lists]

RE: [OM] Reviewing the Basics of PL's with OM-4

Subject: RE: [OM] Reviewing the Basics of PL's with OM-4
From: "Wayne Harridge" <wayneharridge@xxxxxxxxxxxxxxx>
Date: Sat, 15 Mar 2003 10:04:20 +1100
> 
> I'm aware of that effect but hadn't realized that meant the 
> filter factor 
> was not constant.  Since polarized light is not a constant, 
> the effect of 
> removing it wouldn't be constant, but I had not realized that 
> this meant 
> the filter factor was not constant.
> 

Basically all filter factors are nominal (except maybe ND, UV, any
others ?), if you use a red filter in tungsten light (relatively higher
red component of the spectrum compared with sunlight) then the filter
factor will be less than the "nominal" 8x, whereas a green filter will
have a higher filter factor under tungsten than sunlight.  Then the
colour of the subject comes into it to, i.e. how do you want a
particular subject rendered relative to the rest of the scene, e.g. do
you want the clear sky rendered a light blue or a dark blue with the
polarizer in place.

...Wayne



< This message was delivered via the Olympus Mailing List >
< For questions, mailto:owner-olympus@xxxxxxxxxxxxxxx >
< Web Page: http://Zuiko.sls.bc.ca/swright/olympuslist.html >


<Prev in Thread] Current Thread [Next in Thread>
Sponsored by Tako
Impressum | Datenschutz