T3D Re: e-microscope pairs->anaglyph?

[aifxtony@xxxxxxx (Tony Alderson)]

> (...) a co-worker who would like to transform some of his electron
>microscope pairs into anaglyph, I think it was for projection. (...) Can
>transparency film be made to match this?

I've done a little bit of this. Anaglyph projection can work pretty well.
However, for adult audiences I'd recommend keeping the segments short.
Adults have less tolerance for sustained retinal rivalry. (Old dogs and
all... ;-)  )  But in a lecture situation, where the glasses will go on and
off for occasional examples, this won't be much of a problem.

I have experimented successfully with replacing the polarizing filters in a
stereo projector with red/cyan filters. Works well, even for color slides
(within the limitations of anaglyphs, of course).  This could be done with
a pair of overhead projectors, or with opaque projectors, if that's the
kind of media available.

It is also possible to shoot double exposures thru the red and cyan
filters. It takes some experiments to get the exposures balanced. And you
need to devise a registration system to superimpose properly. But it works.
A pin-registered camera is not  necessary--I've done this with my Nikon
FM; if you're careful recocking the shutter the film won't move
significantly. I don't know if Ray Zone monitors T3D, I think he's done
more of this. Try e-mailing him at r3dzone@xxxxxxxxxxxxx, or dupe your post
to P3D.  You may need sharper cutting (denser, purer) filters for the
photography than the filters in the glasses. The Kodak/Wratten filters have
some good choices.

Since the microscope pairs are probably monochrome, you could tint the
emulsions and sandwich the two together, but that seems like a lot of
labor! Would have made more sense around 1920...  Might be possible with
diazachrome (sp?), but that's a lot of effort too.  If you're working with
medium format or bigger, you might be able to work out a negative/positive
contact double exposure routine, but that's beyond me!

Another way I haven't tried, but am sure would work, would be to scan the
pair into Photoshop (or some similar program), make an anaglyph there
(using channel manipulations), then record the composite image out to a
slide.  If your colleague has a company/school scanner & recorder (or
budget!) available, this could be a slick way to go.

Tony Alderson
www.aifx.com




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End of TECH-3D Digest 489
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