[MF3D.FORUM:555] Solution

[Tom Deering <smile@xxxxxxxxxxx>]

>I also see double imaging towards the edges in a gradual way.

If the comment above is accurate, then it one of two things is the 
culprit. Either your lenses are optically different in some way, or 
your camera bodies are.  The gradual double image is a problem of 
geometry, not of mounting.

Check that both cameras are in good shape.  Pay particular attention 
the lens mounting and film plane, which will affect the camera's 
geometry.

You can solve this once and for all for the cost of a single roll of 
film.  Take the following test shots with a single camera on a slide 
bar.  I guarantee the results will be conclusive.

1. Put the camera on a tripod.  Take an ordinary photo with one lens, 
then take exactly the same photo with the other lens, no camera 
movement at all.  This will compare the lens geometry while keeping 
the camera body the same.

The chromes *should* look identical if you sandwich them together on 
the light table.  But the lenses may have different pincushion or 
other distortion.   Maybe one was repaired incorrectly, or 
reassembled incorrectly.

2. Simulate your twin rig with the slide bar.  Shoot with lens A, 
slide the camera five inches, and shoot with lens B.  (Again, with 
the same camera.)  This will test the theory that your slides have 
too much depth.  Try one or all of the MAOFD configurations below:

a. Shoot a scene where the nearest thing is 20 feet away, and the 
farthest thing is at infinity.

b. Shoot a scene where the nearest thing is 12 feet away, and the 
farthest thing is 30 feet.

c. Shoot a scene where the nearest thing is 8 feet away, and the 
farthest thing is 21 feet.

If test #1 makes identical images, and test #2 makes mountable and 
viewable slides, then your camera bodies are geometrically different 
in some way.  I'm betting your lenses will fail test #1.

Best Wishes,

Tom
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