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[OM] Re: Incident vs reflected, was olympus Digest V3 #236

Subject: [OM] Re: Incident vs reflected, was olympus Digest V3 #236
From: "Bill Pearce" <bs.pearce@xxxxxxx>
Date: Sun, 3 Sep 2006 10:10:37 -0500
> You don't point the dome at the camera.  With the translucent dome
> fitted over the sensor you point it at the light source to measure
> _incident_ light.  If you want to measure _reflected_ light you
> remove the the dome and point it at the subject.

Wow, Chris, that's really really wrong, like stick forward houses smaller.

The dome is pointed at the lens. It then averages light falling on the 
subject. If it is pointed toward the light source, it will consistnetantly 
underexpose, as it isn't allowing for the fact that light is not falling on 
parts of the subject.

The proper use of an incident meter is one of those elegantly simple things 
that works almost every time, and gets better results than the most 
sophisticated in camera metering systems. The ultimate use is in 
cinematography, where each shot must not only be well exposed, but match 
lots of others.

Bill Pearce 


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