ISO 19012-1:2013

INTERNATIONAL ISO
STANDARD 19012-1
Third edition
2013-05-15
Microscopes — Designation of
microscope objectives —
Part 1:
Flatness of field/Plan
Microscopes — Désignation des objectifs de microscope —
Partie 1: Planéité du champ/Plan
Reference number
©
ISO 2013
© ISO 2013
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ii © ISO 2013 – All rights reserved

Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Requirements . 2
4.1 Indication . 2
4.2 Definition of plan objectives . 2
4.3 Determination of plan field number . 2
Annex A (informative) Depth of field in object space calculated by Berek’s formula .4
Bibliography . 7
Foreword
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The committee responsible for this document is ISO/TC 172, Optics and photonics, Subcommittee SC 5,
Microscopes and endoscopes.
This third edition cancels and replaces the second edition (ISO 19012-1:2011) by the addition of
“Petzval curvature”.
ISO 19012 consists of the following parts, under the general title Microscopes — Designation of
microscope objectives:
— Part 1: Flatness of field/Plan
— Part 2: Chromatic correction
The following parts are under preparation:
— Part 3: Spectral transmittance
iv © ISO 2013 – All rights reserved

INTERNATIONAL STANDARD ISO 19012-1:2013(E)
Microscopes — Designation of microscope objectives —
Part 1:
Flatness of field/Plan
1 Scope
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 lens and eyepiece, as specified by the
manufacturer.
This marking is consistent with ISO 8578.
NOTE The flatness of the image field does not imply any degree of correction for other aberrations
(ISO 10934-1).
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are
indispensable for its application. For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any amendments) applies.
ISO 10934-1, Optics and optical instruments — Vocabulary for microscopy — Part 1: Light microscopy
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 10934-1 and the following apply.
3.1
tangential structured object
object containing short lines perpendicular to the
...