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ISO 19012-1:2011
M00000199
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ISO 19012-1:2011 Microscopes - Designation of microscope objectives - Part 1: Flatness of field/Plan
standard by International Organization for Standardization, 07/01/2011
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ISO 19012-1:2011 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 19012-1:2011 applies to visual observation using the combination of objective lens, tube lens and eyepiece, as specified by the manufacturer.