Re: understanding...

[P3D John Bercovitz <bercov@xxxxxxxxxx>]

Bill writes:
> Jimmy Songer:
>
>     A further object of the invention is to provide a three-dimensional 
> photographic system of the above character (description of the device. 
> Ed.) in which the resulting photograph is optically sharp at the focal 
> plane, i.e., zero binocular disparity and in which the binocular 
> disparity is directly related to the distance from the focus distance of 
> the lens, and in some applications the disparity can also be made 
> proportional to the defocus blur normally associated with an unfocused 
> image, i.e., the stereo information is carried in the blur normally 
> associated with out-of-focus region of operation of the lens.
 
I write:
>I think this is an interesting description.  It shows you can understand
>how the system works in many different ways.
 
Allan writes:
> Any chance of understanding how the system works based on how it 
> works? or is all this an exercise in "Poetry Interpretation?"
> What does this physical phenomenon mean to you?
> Are we left to conjecture?
 
Sorry, I didn't mean to sound metaphysical.  I was afraid to say how I 
think about it again for a couple of reasons.  One is that I've said it 
so many times before and the other is that it is just like what other 
folks have been saying here now.
 
I think of SL3D as just an analog of a two-lensed system, but an  
anaglyphic one if you like, putting two images down in one locale 
later to be decoded by color.  
 
In contrast, Songer expresses it that the distance between images 
on the film is proportional to the distance of the object from the 
plane of best focus in object space and further he says that the 
information can be carried in the blur.
 
So he takes the general statement I make and applies it to his 
particular system and the results are what he is quoted as saying.  
He's gone from the general to the particular and that gives an 
interesting slant.
 
When Songer says, "the disparity can also be made", he is back-hinting 
at a twin-aperture SL3D system such as Paul Kline constructs.  If you 
do a split aperture, the disparity is strongly related to observable 
lack of focus.  If you use twin apertures, the disparity is also 
related to lack of focus but this is not so easily seen because depth 
of field covers the range.
 
Allan writes:
> Is there no refuge from uncertainty in this life?
 
I think not.
 
All IMHO, of course.
 
John B
 
PS: 
The Songer device has a large black vertical line going through it.
1) What do you think would happen if that line were made wider yet?
2) What do you think would happen if the top and bottom (only) of 
   that line were widened?


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