Optics and photonics -- Designation of microscope objectives -- Part 1: Flatness of field/Plan
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.
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