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P3D Re: Ortho

Message text written by INTERNET:photo-3d@xxxxxxxxxxxxxxxxx
>Ortho might mean perpendicular or it might be Greek. Although I see
several references to a french ortho in the dictionary.<

I'm not sure of its background, but I'm only familiar with "ortho" from
"orthochromatic" film, which is only sensitive to a highly restricted range
of color, in most cases blue, I believe. Orthochromatic film can be
processed in a normal ruby-lit darkroom, for instance.


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