Re: Re: Single-lens Stereo

[P3D Chuck Hassen <deck_0@xxxxxxxxxxxxx>]

-- [ From: Chuck Hassen * EMC.Ver #2.5.02 ] --

The thread on SL3D imaging is very interesting to me; I just had a comment
regarding the principle of operation.  When Paul points out that "The f/1.8
aperture is great because the effect is more pronounced as depth of field
diminishes" I wonder if maybe the cause of the more pronounced effect is a
greater average separation between the red and blue halves, not so much the
diminished depth of field.  The separation of left and right channels of the
image is a function of the diameter of the aperture stop of the lens.  At
f/1.8 the diameter is at a maximum, hence the distance between the centroid
of the red area and the blue area is at a maximum as well.

The implication here is that more glass will equal more stereo separation. 
One wonders what the effect might be of running a wide opaque strip down the
center of a red/blue filter mounted on a large lens (or horizontally across
in the vertical format), and using that instead of stopping the aperture
down to reduce the net amount of light making it to the film plane?  Note
that his would both increase the physical separation of the centroid of the
left and right channel, AND eliminate "noise" from the un-stereoscopically
differentiated center of the lens in one move!

If Paul or anyone else who can provide me some basic dimensional information
(mainly apparent diameter of the aperture, wide open, of the lens employed)
about such a SL3D system, I would be happy to help figure out the
appropriate width for the linear aperture strip to convert an f/1.8 to an
f/4.0 with improved stereo separation??

Chuck Hassen
deck_0@xxxxxxxxxxxxxx



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