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ISO 19012-1:2007 Optics and photonics - Designation of microscope objectives - Part 1: Flatness of field/Plan
standard by International Organization for Standardization, 06/01/2007
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ISO 19012-1:2007 specifies the use of the marking, Plan on microscope objectives, and defines the diameter of the sharp region of the primary image of a flat object surface. ISO 19012-1:2007 applies to visual observation using the combination of objective lens, tube lens and eyepiece as specified by the manufacturer.