ISO 19012-1:2013 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 19012-1:2013 applies to visual observation using the combination of objective lens, tube lens and eyepiece, as specified by the manufacturer.
This marking is consistent with ISO 8578.
Status: PublishedPublication date: 2013-05
Edition: 3Number of pages: 7
Technical Committee: ISO/TC 172/SC 5 Microscopes and endoscopes
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