[Sidefx-houdini-list] aperture focal length relations

Mario Marengo mario at axyzfx.com
Thu Jun 21 14:52:23 EDT 2007


On June 21, 2007 02:41 pm, Gene Dreitser wrote:
> Heya Mario,
>
> As far as I understand it, 6x6,  6x7, and 4x5 are ratios that represent
> exposed film area (long before pixel ever come into play)... which means
> that they should be expressed at 6:6 (a.k.a. 1:1), 6:7, and 4:5
> respectively (not sure how the 'x' came into the equation, or when, but
> it's a common convention in the photography world).

OK. That clears things up. Thanks.
I just found a copy of American Cinematographer, so maybe I can find out some 
more about it all.

... I smell an asset in the making... :)

Cheers!
-- 
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Mario Marengo                                  mailto:mario at axyzfx.com
AXYZ ANIMATION                                 http://www.axyzfx.com
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