Re: "Beamsplitter" & reflected vs. incident

[P3D Don Chaps <dchaps@xxxxxxx>]

On Fri, 23 Aug 1996, P3D William Carter wrote:
 
>   
> shooting a scene lit with a key, fill, kicker, obie etc., a grey card 
                                                 ^^^^
> reading, unlike the incident meter, can't register predictable 
> exposures. 
> 
> -- 
>                 wc@xxxxxxxxxxxx
>     37deg 39.09'N x 122deg 29.56'W x 90'MLLW
> 
> 
A bit of trivia. An obie (small soft light mounted on camera) was 
invented by Merle Oberon's favorite cameraman and named in her honor. 
It's use is make the 3D topography of a face seem 2D (fill wrinkles)(just 
trying desparately to give this some 3D relevance).
        William Carter's post is accurate, but if you've never used an 
incident be aware that some incident meters use a flat opal disk rather 
than an opal hemisphere. These meters will exhibit the same 
characteristics as the 18% grey card he describes. They are, however, 
more accurate for measuring the amount  of light falling on a particular 
plane. The opal hemisphere was invented by Gossen (memory may be failing 
me here). It was an attempt to make incident meters more relevant in a 
real world of multiple light sources and three dimensional subjects.


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