Re: Argh!!

[P3D <CJMCE@xxxxxxxxxxxxxxxx>]

>> The axes of the lenses themselves are parallel or you would 
>> indeed get keystoning.

>Now why'd I have to go and say _that_?  If you swing a lens axis, 
>you swing the plane of best focus relative to the plane of the
>film: the two planes are no longer parallel.  If you want to
>get keystoning, you have to swing the film plane relative to
>the direction the camera is looking in.  (And then you would
>consequently very likely have to swing the lens to get a sharp 
>image across the film plane.)  

... and when you swing that lens, as in a rectifier, you then satisfy
the Scheimpflug Condition ... keeping all of that in focus.

so there.

Clifford J. Mugnier  (cjmce@xxxxxxx)
Topographic Engineering Laboratory
Department of Civil & Environmental Engineering
University of New Orleans
New Orleans, Louisiana  70148
Voice: (504) 286-7095
FAX:         286-5586


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