Use for 16 x 20 ortho plates?

Discussion in 'Ultra Large Format Cameras and Accessories' started by nexus757, Mar 15, 2011.

  1. nexus757

    nexus757 Member

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  2. greybeard

    greybeard Member

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    Given that they are a) glass, and b) lithographic (per the developer recommendation) they were probably used for something where dimensional stability was paramount, possibly cartography, the making of masters for photomask reduction, or large-scale reticles. Why they would be ortho rather than blue-sensitive is a bit puzzling.

    Very interesting---I hope someone can come up with an authoritative answer.