Re: My cloud story...

[P3D Paul Talbot <ptww@xxxxxxxxx>]

DrT stated:

> a little bit of rivalry can be better tolerated in projection

Hmmm.  I don't know.  What is "a little bit of rivalry?"  I have
found projected slides with a spot on only one of the images quite
annoying.  I suppose if I could view some projected 3Discover images
I would have a much better idea about how well rivalry can be
tolerated in projection. ;)  Which makes me wonder...has anyone out
of curiousty sacrificed a 3Discover cassette to experiment with
mounting the images in 7P (or wider) stereo slide mounts, and either
T'dRB viewed them or projected them?  (Or did Gabriel already tell us
about trying this?)

> >What type of clouds were in the sky, George?
> 
> What do you mean?  Clouds are clouds, right? :-)
> 
> I don't know... They were light (not dense), rather high in the sky and
> seemingly far away from me, only by the setting sun. <snip>
> But I have taken pictures of "fluffy summer clouds" in the USA from a
> moving car and found the resulting retinal rivalry, disturbing...

That's the distinction I was getting at.  The "fluffy summer clouds"
move and change shape quite rapidly and should be avoided for non-
simultaneous stereo.  (Meteoroligically, I don't know whether the
"movement to shape-shifting ratio" is any different for high thin
clouds.  They usually don't *appear* to even move much as we look at
them, so it seems the required time interval between Left and Right
image shots could be rather long.  As Greg mentioned, the time between
shots on an airplane hyper can avoid the shape-shifting problem.  But
note that clouds are still a problem for airplane hypers if they are
anywhere close to the aircraft.  The smallest of clouds, if close by,
can wreak havoc with your attempts to keep on-film deviation to
tolerable levels.

Paul Talbot


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