RE: lenticular variables

[P3D Grant Campos <gc6094@xxxxxxxxxxxxxxxxxx>]

To find the source and description of the equation, do a search in the 
archive for, "macmaofd.xls"

The equation gives the separation to make your pictures so that you will 
get the maximum depth in your picture, without killing your eyes.

I made some changes to John Bercovitch's equation,

B (or B0) is the distance between the two lenses, d is the maximum on film
deviation, "a" is the focus setting of the camera, "an" is the distance to
the closest thing in the picture, "af" is the distance to the farthest 
thing in the picture, "f" is the focal length of the camera.

I programmed a little spread sheet in my Sony Magic Link that spits back 
the "af" when given a fixed "B0" and a given "an", or it spits back an 
"an" when given a fixed "B0" and a given "af".   If you have a SONY Magic
link and want that spread sheet, let me know.

I made the assumption, in my calculations, that I would be focussing 
at the distance that would make the "an" and "af" equally focused, 
therefor a = 2 * an * af / (an + af)

I substituted "f/30" for "d"                       

I also put in factors so I could have:      

B0 and "f" in mm, "an" and "af" in feet

MY two equations are:

an = (af * ( 60 * B0 + f)) / (60 * B0 - f + (609.6 * af))

af = (60 * B0 - f) / ((60 * B0) + f - (609.6 * an)) 


Remember, B0 will depend on which images are seen at the same time.
I'm calling on the 30th to find the answers.

Hope this helps.
Grant Campos


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