P3D Re: Hack a Nimslo to take close(r)-up shots

[erker@xxxxxxxxxxxxxx (Greg Erker)]

Tom Gardner wrote:
>>There is no problem with the lenses' performance,
>>but it is quite easy to get excessive depth of
>>field and to have an exaggerated Z dimension. I
>>presume these characteristics are common to all
>>closer-up stereo photography,

Then I (Greg E.) wrote:

>|  I would assume this is from taking the photo
>|with a 30mm lens and then viewing it with a longer
>|FL lens (like the 44mm in the Red Button which would
>|give a stretch of 44/30 = 47%).

Then Tom wrote:
>There is no such Z magnification with the outer lenses which
>I've left at their factory position (i.e. > 7' etc)

  With a reduced stereo base you get an equal
scaling in all 3 dimensions. The 18mm centre
lens separation is about 1/3.6 of normal stereo
base so object should look 3.6x as big as normal.
But this should be in all 3 dimensions, not just
the Z axis.

  Anyone have an answer for what Tom sees?

Greg E.



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End of PHOTO-3D Digest 2993
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