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[OM] Re: Telecentricity

Subject: [OM] Re: Telecentricity
From: Chuck Norcutt <chucknorcutt@xxxxxxxxxxx>
Date: Wed, 24 Aug 2005 21:48:51 -0400
David Carter wrote:

> Would shining a light through a lens onto a bit of paper placed the same 
> distance away from the lens as the sensor is, work?
------------------------------------

That would tell you the absolute limit but it's not that simple.  If you 
shone a light through it the image formed by the light beam would start 
to vignette and eventually fall off to nothing.  Obviously, you get 
nothing beyond that point.  However, the point of light extinction is 
likely well past the usable image circle where "usable" implies a 
certain standard or resolution and freedom from abberations such as 
chroma, coma, etc.

Chuck Norcutt


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