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  1. John A Roberts

    Is "3-D" More Natural in Porros or Roofs?

    In relation to the posts above, some images of devices with significantly altered stereopsis compared to regular Porro prism binoculars: a) When Zeiss commenced production of Porro prism binoculars in 1894, they also offered a handheld Stereo Telescope, aka a Relief-Fernrohr (it uses a...
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