RE: [photo-3d] RBT X3 measurments

["Greg Kane, MD" <integrity@xxxxxxxxxxxxxxxxx>]

No doubt there's a brilliant optical-analytical technique to figure out the
window with David's numbers -- I'm not smart enough to do it.

However, if the point is to find the window rather than to be brilliant, I
do know an easy way:

A.  put up a row of little signs, numbered 5, 6,  7, 8, etc. locating the
signs 5, 6, 7, 8, etc feet away from the camera.

B.  With the X3 at the 0 foot mark, take one photo of the signs.  Print film
would be easiest.

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.

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

Cheers,
Greg

Greg Kane
Amateur Photographic Exchange Club
mailto:pgwhacker@xxxxxxxxxxxxx
http://home.earthlink.net/~pgwhacker/APEC/HowTo/HowTo.html





> My friend and fellow list member Fritz Brown had his handy-
> dandy calipers at work today so we measured my RBT X3A. Here
> is what we got:
>
> Interlens spacing: 66.0mm
> Film gate width: 32.7
> Outside gate "reducer": 1.0mm
> Inside gate "reducer": 2.1mm
> Distance between film gates: 34.5mm
> Distance from film gate to film gate: 67.2mm
>
> Given these figures, can any of you math types calculate where
> the window is set?
>
> Here is what you get on your film chips (unfortunately these
> were made at home with a ruler):
>
> The progression is 1R, 2R, 1L, 2L, 3R, 4R, 3L, 4L, etc.
>
> The spacing between the first and second is almost nothing,
> between the second and third is 1.0 to 1.5mm, between the
> third and forth is almost nothing, between the first set and
> second set is 4.0mm. The total from the start to end of each
> group is 133mm. With 32.7mm for each of four chips that is
> 130.8mm, add to that the 1.5mm for the middle space and you
> are left with 0.7mm to split between the other two chips - so
> although they are close, they do not overlap. Most of the time
> there is a thin black line, but occasionally the images butt.
>
> That's all for now,
>
> David W. Kesner
> Boise, Idaho, USA
> drdave@xxxxxxxxxx
>
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