Re: understanding...

[P3D John Bercovitz <bercov@xxxxxxxxxx>]

Allan writes:

> John writes:
>> 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.  

> "John, there you go again!"  -R. Reagan

You bet.  8-)

[deleted]

> I think what Paul Kline is making is a neat idea - but it is more
> of the "two lenses making two separable images."  That is something
> different from "SL3D."

Really?

[deleted]

> John, rhetorically, why can't you take a stereo pair of something
> close to the camera and include something in the frame which
> is apparently at infinity? I can see that with my eyes and look
> near, then far?

Why Allan, here you are asking more questions of me and you haven't 
yet answered my questions of you.  I'll repeat and give you more of 
my questions below.

But to answer this latest of your questions first, I don't know why you 
can't go from closeup to infinity in one stereo pair.  I only know that 
the thing will start to dissociate if you try to shoot it with a normal 
stereobase.  Maybe Jim C can tell us why, though I don't know if even he 
knows this one.  However, if you reduce the stereo base by putting the
two lenses close together as in a macro camera or as in SL3D, you won't
have this lack-of-fusion problem any more.

> Is the horse dead again yet?

P'raps not.  Is there a veterinarian in the house?

OK, now you have to think about my questions; fair's fair.

The Songer device has a large black vertical line going through its filter.

1) What do you think would happen if that line were made wider yet?
2) What do you think would happen if, in addition, the top and bottom 
   (only) of that line were widened?
3) What would happen if you took a shot with the red half of the lens
   and then advanced the film and took a shot with the blue half of
   the lens and then merged the two shots using a computer?
4) What would happen if you instead put the two shots in a viewer and
   merged the two shots with your two eyes?

What I'm driving at here is, where do you think it's no longer SL3D and
has instead become separated pairs?

Thanks,
John


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