Re: SL3D per John B et al

[T3D <PK6811S@xxxxxxxxxxxxxx>]

John B wrote:

>In the ideal camera lens (and most these days aren't too far from 
>ideal) the imaging is plane to plane.  Only an object point in the 
>in-focus object plane will be in focus on the image (film) plane.  
>All object points not on the in-focus plane are out of focus.  OK, 
>now I would contend that any and all parts of the lens focus each 
>individual point of the in-focus object plane to the same individual 
>place on the image (film) plane or else the thing is out of focus.  

Before I get roasted over a pile of burning introductory optics texts:

You are right of course, every point on the lens, even though having
different perspective, still paints object-plane points in the same
places on the image plane.  Otherwise how could we create sharp
flat pictures?  So the two paths agree for points in the
object plane, just not for points out of that plane.

Is this different from a two-lens system?  Say I line up a lens
perpendicular to a flat wall, with a square drawn on the wall, and
take a picture.  Then move the lens horizontally 6 inches to the
right and take another picture.  Apart from the shift, is there
any other difference between the two square images that are created?

If the answer to the above question is no, then I can't find any
difference between SL3D and 2L3D that is not attributable to the
construction of the particular device.

Paul Kline
pk6811s@xxxxxxxxxxxxxx


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