Re: Hyperstereo applications of the 1/30 rule

[P3D Larry Berlin <lberlin@xxxxxxxxx>]

> Dr. George A. Themelis writes:
>A quick comment regarding possible misapplications of the 1/30 rule (not
>much to do with the moon):
>
>The 1/30 and similar rules aim in producing a stereo pair that has a
>certain amount of on-film deviation.  For hyperstereos, the 1/30 rule where
>the closest subject is at 30 times the interocular distance and there is
>also infinity present, will result in the same amount of on-film deviation
>as a regular stereo with the closest object at 7 feet and infinity present.
>
>If there is no infinity present, you will get less on-film deviation.
>
>Practical example:  Suppose you are shooting fireworks.  The 1/30 rule will
>make the firework burst separate from the background (stars?) but
>might not give you adequate depth in-between the burst or different bursts
>within a small area.
>


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. In practice I guess, based on visible deviation in the viewfinder of my
single SLR camera as I slide it sidewards. When it seems enough to work with
(scan, reduce and still be present) I snap the picture.

While it's true that you can enjoy 3D depth and stereo images in any
resolution, if your intended output is the computer screen, you should plan
your images accordingly and work more on the *hyper* side of things (but not
too much).  Parallax has to be present in your intended output in order to
be seen with the eyes. If it's too small in the original image pair, it may
not be present between the pixels on the screen. This can reduce or distort
the visible depth. 

Larry Berlin

Email: lberlin@xxxxxxxxx
http://www.sonic.net/~lberlin/
http://3dzine.simplenet.com/


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