3D & lens/film/print res

[P3D John Bercovitz <bercov@xxxxxxxxxx>]

I said something in my previous post about APS and film resolution 
requirements.  It got me to thinking.  You know, 3D is about as 
tough as anything in resolution requirements.  The only thing I 
can think of that's close is a mural-size print.  The reason is 
that we 3Ders view from the center of perspective or thereabouts 
whereas everyone else views from quite a bit farther out, making 
lack of resolution not apparent.  Consider the ordinary snapshooter.  
He takes a picture with a 35 mm lens or a 50 mm lens and has it 
printed on 4" x 6" paper and then he views it from 16".  Since
the negative is 24 mm high, he should be viewing it from
(35/24)*4" = 5 7/8" or (50/24)*4" = 8 5/16" and _not_ from 16".  
In other words, the snapshooter only needs about half the resolution 
that a 3Der does.

You can check projected slides too.  Here projector lens and screen 
resolution come into play where enlarger and print paper came into 
play in the previous example.  If the slide is shot with a 35 mm 
lens and projected onto a 4' wide screen, then the spectator should 
sit 4' from the screen.  I haven't seen this happen too often.  8-)
 
John B
 


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End of PHOTO-3D Digest 1300
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