ISO 1203:1998

Photography — Roll film cameras — Back window location

Photographie — Appareils photographiques à pellicules — Emplacement du voyant de déroulement

General Information

• Status: Published
• Publication Date: 14-Oct-1998
• ICS: 37.040.10 - Photographic equipment. Projectors
• Technical Committee: ISO/TC 42 - Photography
• Drafting Committee: ISO/TC 42 - Photography
• Current Stage: 9093 - International Standard confirmed
• Start Date: 20-Dec-2023
• Completion Date: 12-Feb-2026

Relations

• Revises: ISO 1203:1984 - Photography — Roll film cameras — Back window location and picture sizes
• Effective Date: 15-Apr-2008

Overview

ISO 1203:1998 - Photography - Roll film cameras - Back window location defines how the back (inspection) window of roll‑film cameras is positioned relative to the film spools and film aperture. Prepared by ISO/TC 42, this fourth edition (1998) replaces the 1984 version and gives locating dimensions and basic tolerances so manufacturers and service organizations can ensure consistent back‑window placement for common roll‑film formats.

Key topics and technical requirements

• Scope: Specifies the location of back windows of roll film cameras in relation to the number of exposures and nominal negative sizes.
• Locating dimensions: A figure and table associate the back‑window position (dimensions X and Y) with the centre lines of the supply and take‑up spools and the aperture. The key diagram identifies: take‑up spool, supply spool, centre line of spool and centre line of aperture.
• Trade designations and formats: The standard provides locating data for common trade designations and nominal negative sizes used with roll films (for example, 4.5×6, 6×6, 6×9 and related exposure counts).
• Tolerances: The tolerance for dimensions X and Y is specified as –1.6 mm.
• Window size: The document sets a minimum back‑window diameter of 9.0 mm.
• Technical clarity: The standard helps align mechanical design (spool centres and aperture) with user‑visible inspection windows for accurate frame identification.

Applications and who uses it

ISO 1203:1998 is practical for:

• Camera designers and manufacturers who need consistent back‑window placement across models that accept similar roll film formats.
• Repair and restoration specialists ensuring that replacement backs or aftermarket modifications keep correct film indexing.
• Quality control and inspection teams verifying mechanical conformity in production.
• Heritage camera researchers and technical authors documenting mechanical standards for analog photography equipment.
• Accessory makers producing replacement backs, film holders or inspection devices that must align with established spool and aperture geometry.

Practical benefits include reliable frame counting through the back window, interoperability with standard roll films, and predictable film winding behavior.

Related standards

• ISO 1754:1998 - referenced in ISO 1203 as containing picture sizes moved from the earlier edition.
• Developed under ISO/TC 42 (Photography) - consult related photography standards for complementary dimensional or film‑format requirements.

Keywords: ISO 1203:1998, back window location, roll film cameras, photography standard, film sizes, locating dimensions, camera design, inspection window.

Standards Content (Sample)

INTERNATIONAL ISO
STANDARD 1203
Fourth edition
1998-10-15
Photography — Roll film cameras — Back
window location
Photographie — Appareils photographiques à pellicules — Emplacement du
voyant de déroulement
A
Reference number
Foreword
ISO (the International Organization for Standardization) is a worldwide
federation of national standards bodies (ISO member bodies). The work of
preparing International Standards is normally carried out through ISO
technical committees. Each member body interested in a subject for which
a technical committee has been established has the right to be represented
on that committee. International organizations, governmental and non-
governmental, in liaison with ISO, also take part in the work. ISO
collaborates closely with the International Electrotechnical Commission
(IEC) on all matters of electrotechnical standardization.
Draft International Standards adopted by the technical committees are
circulated to the member bodies for voting. Publication as an International
Standard requires approval by at least 75 % of the member bodies casting
a vote.
International Standard ISO 1203 was prepared by Technical Committee
ISO/TC 42, Photography.
This fourth edition cancels and replaces the third edition (ISO 1203:1984),
of which it constitutes a technical revision. The picture sizes in the third
edition have been transferred to ISO 1754:1998.
©  ISO 1998
All rights reserved. Unless otherwise specified, no part of this publication may be reproduce
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