I have once tried to make a stereo with a very special lens, intended
for looking into throats, knees, bellies, etcetera. A fiber light
source can be attached. It is an Olympus endoscope (aka borescope) of
the rigid type; flexible endoscopes don't give enough image quality to
work with.
With an adapter it can be mounted to OM and E-series cameras. It has a
very wide angle, and because of its small size (2 or 3 mm across) it
can be used perfectly to make pictures of the interior of doll's
houses, the inside of flowers, etcetera.
But I have never succeeded to make a good stereo picture with it,
probably because the amount of shifting needed between pictures is too
small...
Frank.
On Wed, 5 Aug 2009 10:07:41 -0400, DrT (George Themelis) wrote:
>To take a hypostereo you need a close-focusing lens (like a macro lens) and
>a slide bar (the slide bar is almost a necessity in this case. You put the
>camera on the slide bar, take the first picture, shift/slide the camera by a
>small amount, take the other picture. The rule of thumb regarding the
>amount of shifting (also known as the "stereo base") is 1/30 the distance of
>the nearest object.
>
>You do not need a shift lens, just a regular lens. The camera is shifted by
>the required amount.
>
>The shift lens is commonly used to "correct" perspective. A stereo picture
>of a building taken with a shift lens, actually looks strange is 3d.
>Perspective is natural in 3d. "Perspective correction" is unnatural.
>
>George
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