T3D Re: afocal keystone effects

[Tom Hubin <thubin@xxxxxxxxx>]

John Toeppen wrote:
> 
> Tom clealy understands why the movements view camera are necessary if
> you want to achieve geometric perfection of a tilted object in image
> space using an afocal image relay system.
> There is a line that I draw between data acquistion and art - but that
> line moves around alot.  I have actually made systems using afocal
> relay  optics to map pits and chips in laser glass in x,y&z.
> You can even buy telecentric (afocal) optics if you don't build your own
> out of garage stuff.
> 
> John Toeppen
> 
> http://members.home.net/toeppen/index2.htm

Hello John,

I am definitely in the data acquisition domain. 

I don't understand how telecentric comes to play here. An optical system
may be afocal or telecentric or both or neither. As a simple example, a
single lens system can be telecentric but it cannot be afocal. I don't
think that a telecentric system does anything special for phantagrams.

Tom Hubin
thubin@xxxxxxxxx


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End of TECH-3D Digest 487
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