1/30, 1/20 or 1/50?

[P3D Dr. George A. Themelis <DrT-3d@xxxxxxxxxxxxxxxxxxxxxxxxxxx>]

Larry says that he likes working with more deviation than the 1/30 rule,
closer to 1/20 that works well (better?) for computer screens.

>I've heard (here on the list : -) that this rule is a variable one and
>generally ranges from 20:1 to 30:1. If you enjoy looking at things from 7
>feet away then 30:1 is a good rule. I generally want to look at *things that
>I like* from a closer perspective so would choose to work on the 20:1 side
>of the scale for objects or arrangements and the other side for landscapes
>etc.

The rule aims at a certain on-film deviation so if you shoot objects closer
than 7 feet you might want to shift *less* (1/20 is more than 1/30) if you
plan to include infinity.

Those concerned with big screen projection are usually more conservative
and go for even less than 1/30, typically 1/50.  Stan White confesses 
using 1/50 in his table-tops close ups and one of his justifications
for doing so is that more depth is not always more desirable.

I understand how for computer work you might want more deviation.  But
if you plan to project those images in a large screen stereo projection,
you might want to consider 1/30 or less.  Is this an area where computer 
3d and stereo projection have a conflict?

George


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