[photo-3d] Re: Spicer mounting problems

[Ralph Johnston/Linda Sherman <copley@xxxxxxxxxxxxxxx>]

I taped up 20 old Spicer mounts without any film and projected them.  I
found a
few that bulged on the right side.  It turns out that I had not kept the tape
tight when I folded it over on that end on those few.   I checked the mounted
slides with the problem and found that in most cases, there was a loop of tape
on the right end, but it was tight on the left end.  I now realize that the
problem was the way I was holding the slide during taping.  I was pinching the
slide together on the end near me, but not pinching very well on the far end. 
The with 8 perf mounts it is hard to pinch without touching the film.

Sorry to cause such a fuss over taping but maybe someone else is having the
same problem.  I added another layer of silver tape on the right end, this
time
very tight, and they projected OK.

Thanks Paul T, Dave K, and Bob B for your help.

Regards -Ralph




>
> My thinking now is that the Brackett Fader projector needs adjusting.  Bob
> Brackett offered to adjust the spring tension after this Sunday's Stereo New
> England meeting.  The slide is held against two wide upper rails by two
> narrower springs at the bottom of the slide.  If these are not matched one
> end of the slide may bow more than the other end.  I get up to 1" vertical
> error in the window outlines out of 20" so this is pretty bad.  It may also
> depend on how tight the tape is across the bottom.  Maybe it isn't as tight
> on one end as on the other.  If that is the problem, then adjusting the
> spring tension won't help.
>
> I measured 10 mounts folded but not taped and could not see any difference
> end to end.  But after mounting, taping, and projecting I could.  That is
why
> I had to add the scotch tape on the right image.
>
> More later on this subject.  I would like to keep using the Spicers if at
all
> possible.
>
> Regards -Ralph





>
> Message: 8
>    Date: Tue, 12 Sep 2000 21:58:59 -0500
>    From: Paul Talbot <list_post@xxxxxxxxx>
> Subject: Re: Spicer mounting problems
>
> Ralph Johnston/Linda Sherman wrote:
> > 
> > I mounted a few recent rolls of RBT 8-perf slides in Spicer wide 8perf
> > mounts.
> > They look great in a viewer, but when projected in a Brackett fader
> projector,
> > had vertical alignment problems.  About 1/4 of the slides had an inch of
> > vertical error on the screen.  (The image was about 20 x 30") [snip]
> > Then I measured the slide  with a
> > digital caliper and found that it was tapered!  One end was 40.0mm while
> the
> > other end was 39.9mm.  Or one end was 40.0 and the other 40.1mm.


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