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ISO 19012-1
M00000720
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ISO 19012-1 3rd Edition, May 15, 2013 Microscopes - Designation of microscope objectives - Part 1: Flatness of field/Plan
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Description / Abstract:
This part of ISO 19012 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. This part of
ISO 19012 applies to visual observation using the combination of
objective lens, tube and eyepiece, as specified by the
manufacturer.
This marking is consistent with ISO 8578.
NOTE The flatness of the image field does not imply not any
degree of correction for other aberrations (ISO 10934-1).