Re: PePax and dollhouse effect

[P3D John Bercovitz <bercov@xxxxxxxxxx>]

Larry B writes:
 
>                        0                       object
>
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>                    |-|   |-|                   Standard  aperture
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>                |--|         |--|              Longer lens and larger aperture
>
> Wouldn't a corresponding increase in aperture, along with the longer lens, 
> correct the perspective problem and do away with the dollhouse effect?
 
No, the perspective is the other way 'round: It's the angle the object
subtends at the lens.
 
> Isn't there an existing formula for this that includes the aperture
> size in the calculation?
 
Yes there is a formula for stereo using relative aperture but I've never 
used it and don't recall it.  I think maybe Dr. T has mentioned it.  Anyone 
remember it?  Basically, the depth of field is set by the relative aperture 
and the on-film deviation is also set by the depth of field so the two can 
be linked.
 
John B


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