T3D Re: PePAX Forever

[john bercovitz <bercov@xxxxxxxxxxx>]

LeRoy writes:

> In general non-ortho can't be made "natural" though it can be made
> pleasing. I think PePax is a place to start when using varied lens 
> separations and lengths.

Well, it's easy enough to calculate the degree and nature of the
distortion following Ferwerda or Piper.  The change in base makes
a change in all three dimensions and the change in focal length
makes a change in only the depth dimension.  So pick yer poison.
8-)  One thing's for sure, if you use 30,000 mm lenses to look at
a bird 100 meters away, you ain't going to see much depth with a 
normal stereobase.  8-)

John


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