[MF3D.FORUM:419] Re: fl/30

[Tloc54452@xxxxxxx]

> I can appreciate your decision to use the same inter-lens spacing for every
> image, but you seem to be implying that non-orthostereoscopy is an error.
> I believe it is simply an artist and aesthetic question which is neither
> right nor wrong.

Agreed.  To me, the classes of geometric "errors" are rescaling, which is
done with the stereobase alone, and stretch/squash (it's due to perspective 
mismatch) which rescales the depth independent of width and height.  I 
don't think of the former as an "error" because it's usually done on purpose, 
but the latter is an error if you do it by accident and don't like the 
effect.  
Pornographers, I understand, love the stretch effect for full-frontals.  
I wouldn't call that an error; it's a choice.

I've done lots of non-standard-base pairs for effect.  I just don't use it
when I don't want the effect.  Got a shoot coming up of some models the
guy wants rescaled to life size, in fact.  But I haven't found a use for
stretch/squash yet.  Perhaps one day I will.  If I do, I'll be able to get
the magnitude of effect I want by simple calculation.

> (And I suppose that by definition a black and white image is not

> ortho -- is that an error too?)

Inasmuch as orthoscopy is really applied geometry, I think not.  ;-)

> The scientific reflex to quantify and categorize is valuable, but the 
> subtleties of art do not always lend themselves to this kind of 
> thinking.

How sharper than a serpent's tooth...   ;-)

John B