RE: [photo-3d] RBT X3 measurments

["David W. Kesner" <drdave@xxxxxxxxxx>]

Greg Kane writes:

> C.  When you get the prints back, measure the distance from
> the edge of the photo to each sign.  ID which sign is the
> same distance from the edge in both the L and R stereo half.
> That's how many feet the stereo window is from the camera.

My X3 is equiped with 28-70mm zoom lenses. Does the "built-in" 
window change at different zooms?

To make it even more difficult, what happens when I attach the 
macro unit? Different at 6mm and 11mm stereo bases?

> No doubt there's a brilliant optical-analytical technique to
> figure out the window with David's numbers

Perhaps this will have to be used?

> BTW Jon G mentioned to me a while back the answer is 12 feet
> for the full frame X3.

I have not measured a full frame RBT, but I would guess that 
there isn't a built in window as the optical path from lens to 
film gate on each side has not been modified from the original 
camera. It would be no different than side by side cameras. Of 
course I have been dead wrong before *{;-)

That's all for now,

David W. Kesner
Boise, Idaho, USA
drdave@xxxxxxxxxx

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