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P3D Re: Three L rule

  • From: Peter Davis <pd@xxxxxxxxxxxxx>
  • Subject: P3D Re: Three L rule
  • Date: Tue, 22 Feb 2000 13:01:22 -0700
At 02:40 PM 2/22/00 , you wrote:
> >>The rule says:  The Left eye should see Less in the Left side.
>
>
> > Actually, this rule can be confusing...
>
>Actually (and with all due respect) you are confusing things by
>misapplying the rule.  This rule is for setting the stereo
>window when mounting stereo images.  If you look through a REAL
>window, your left eye will see less of the scene along the left
>edge of the window.  Similarly, when you mount stereo images,
>the left chip should show less of the scene in its left side.
>The rule works!!!
>
>Now, how can we explain your observation that the left eye
>generally sees more *from the left side of things* than the
>right eye?  When looking through a real window, the left eye is
>forced to look from the RIGHT side of the LEFT edge (and the
>LEFT side of the RIGHT edge).  Hence, it sees LESS in the LEFT
>side and MORE in the RIGHT side.
>
>Actually, the way I apply this rule when I mount stereo slides
>is this:  My RIGHT EYE should see MORE on the LEFT side.  But it
>is easier to learn this as the THREE L RULE than the RML rule...
>
>Confused more?
>
>Honestly, this is one of the most practical rules I have learned
>in stereo photography.  I now instinctively look to see if I see
>more in the left side of the right chip.  I don't even think
>about it.  It is easy to learn the rule if you remember the
>three L's.  But after you use it for a while, it will become
>second nature, no matter how you apply it.


I had somehow lost track of the fact that we were talking about mounting 
and the stereo window.  Sorry.

Actually, a simple rule is "mask the outside edges".  This means the left 
edge of the left image, and the right edge of the right.

-pd


--------
                              Peter Davis
                Funny stuff at http://www.pfdstudio.com
               "The artwork formerly shown as 'prints'."
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