[tech-3d] Re: Different F.L.s

[siggyblue@xxxxxxxxx]

Chuck,
Thanks for the suggestion of  "Stereo Photograph" by Fritz G. 
Waack DGPh AFIAP.  I just ordered it.
Although I have been taking 3-d picts for years I never could 
figure out why some stereos worked better than others. Now 
thanks to disscusion groups like this and other internet info I'm 
finally getting an education!  I am striving for maximum 3-d effect 
that can be viewed by most people.
Any other books you might suggest?
David
--- In tech-3d@xxxx, "Chuck" <cfholzner@xxxx> wrote:
> 
> > > --- In tech-3d@xxxx, siggyblue@xxxx wrote:
> > Thanks Chuck.  I all ready know about increasing the focal 
length
> > to match the print enlargement.  the problem is the viewer 
F.L. is
> > around 230mm. If I were to preportionally increase my views 
they
> > would be much larger than is possible to view.
> 
> True, You would need to either crop your photos, use prismatic 
lenses to
> increase the distance between the prints, or use a shorter 
focal length on
> the viewer lenses.
> 
> > What do you mean by ortho?
> 
> Orthoscopic.  Objects in the viewer look to be the same size 
and distance
> from you as they did when you were at the sight taking the 
picture.  When
> you said that you heard that the viewer lens FL should match 
the Camera's,
> You were implying "Orthoscopic".  If you are not looking for 
"orthoscopic"
> then the FL's become variables to be used in various formulas 
to allow
> deviation from orthoscopic and yet allow the picture to be 
viewed in
> comfort.
> 
> > When you say a longer focal length "increases the depth".  
Do
> > you mean the viewers perception of depth?  Or are you 
referring
> > to the actual distance from lens to print?
> 
> Viewers perception.  A longer focal length of the viewing lenses 
leads to an
> exaggeration of the depth, whereas too short a focal length 
produces the
> opposite effect.
> 
> 
> You should get a copy of "Stereo Photograph" by Fritz G. Waack 
DGPh AFIAP.
> Reel 3D Enterprises sells it.
> 
> Chuck


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