[photo-3d] Re: The jig's up

["Kenneth Luker" <kluker@xxxxxxxxxxxxxxxx>]

From: "Kenneth Luker" <kluker@xxxxxxxxxxxxxxxx>

>From Gabriel:
> If you don't "correct" for the rotational "errors", do you see
> any tilt, or any tilt that is objectionable? If not, then it's
> not necessary  (and is actually better) to correct for any tilt
> that shows up using the mounting gauge.

I'm not sure I understand your question, but I believe that 
by using the mounting gauge, I can ensure that there is 
no rotational error anyway.  

Just so we're using the same terminology, by rotational 
error I mean a condition where the (nominally horizontal) 
line between two image points on one chip is not parallel 
to the line between the same two image points on the 
other chip. Rotational error (at least for images taken with 
a Realist) is a mounting error,  whereas tilt is a camera 
positioning artifact that is an error only if the photographer 
meant to have the camera level.   Rotational error is 
extremely uncomfortable to view and should be avoided at 
all costs.  

Tilt however, quite distinct from rotational error, may or 
may not be objectionable, as you suggested.  If it is, then 
it can be eliminated using the method I described.  Rotate 
both chips by the amount needed to bring what should be 
horizontal into a position parallel to the bottom and top of 
the mount's openings.  The gauge helps ensure that the 
rotations are equal.  Then move either of the chips 
vertically until the window frames are congruent.  The 
latter adjustment eliminates vertical mounting error, but 
introduces technically but almost always imperceptibly a 
slight error that in my opinion is much more acceptable 
than the tilt error I was trying to eliminate in the first place. 

My whole point is that IF I want to remove the tilt during 
mounting, I can't do it if I'm using a jig or pin-enabled 
RBTs.  Sorry if this twisted description puts a bad slant 
on things. :)

Ken Luker
_______________________________________________________________
Kenneth Luker
Marriott Library Administration
KLUKER@xxxxxxxxxxxxxxxx

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