Re: [photo-3d] Re: heat seal vs spicer vs RBT, now vs alum/glass, on and on!

["Dr. George A. Themelis" <drt-3d@xxxxxxx>]

Chuck Holzner wrote:

>I need some numbers.
> What is the tolerances on Vertical, Horizontal, and Rotational errors 
> allowed for:  Precision mounting?

Zero? :)

> Well mounted?  > Correct alignment? > Kodak?
> What can you expect from:
> Alum/Glass?  > RBT without the anti-newton glass?
> RBT with the glass? > Spicer? > Heat seal? > Slip in?

I don't know the answers but will like to point out that they are
subjective.  "What is good for you?"   What are you going
to do with the slides?  View them in the viewer, in projection,
in the web?  The answers are tied to the viewing method and
each individual's expectations.

I noticed you tie your questions to the mounting medium.
"What to expect from?".  I would say you can get near
zero misalignments with ANY mounting material.

Also, there is no such thing as horizontal misalignment
because, unlike perfect vertical alignment, there is no
perfect horizontal alignment.

> The only number I have seen in the string is .1 MM for vertical on 
> the RBT.

The RBT mounts allow adjustment of vertical alignment in
steps of 0.1mm.  However, the maximum error tolerated is half 
that, 0.05mm, because you can always go to the next step.
>From my mounting experience, I would say that 0.05mm is
good enough.  It would not bother me.  Even though you read
that it bothers some other people.

Ferwarda in "The World of 3D" has some discussions
on this subject too.

Another type of problem you might want to include in your
list is mismatch of focal lengths.  This is of interest to those
using twin cameras mainly.

George Themelis