Overview
ISO 732:2000 - "Photography - 120-size and 220-size films - Dimensions" is an international standard that defines dimensional and identification requirements for medium-format roll film (120 and 220 formats) and the common spools used with them. It specifies physical tolerances, backing/leader and trailer paper details, paster-tape placement, minimum film leader/trailer lengths, and standardized markings to identify intended photofinishing processes.
Key Topics
- Scope and measurement conditions
- Dimensions and tolerances apply at manufacture under controlled conditions (referenced to ISO 1 and ISO 554 climate/measurement specifications).
- 120-size film
- Requirements for backing paper (width limits, thickness range of 0.06–0.12 mm), film+paper thickness (0.24 mm ± 0.04 mm), and paster tape overlap limits (short side ≤ 25 mm; overlap on film ≤ 15 mm).
- Exposure-number orientation and register marks for automatic metering are defined.
- 220-size film
- Specifications for leader and trailer paper (thickness 0.06–0.12 mm; combined leader/trailer+film+paster tape maximum 0.51 mm), register-mark placement, and paster-tape dimensions similar to 120-size.
- Spool dimensions
- Spool geometry and tolerances for flanges, axial hole, and key slots used as camera take-up engagement are specified to ensure mechanical compatibility.
- Identification and photofinishing markings
- Standard edge patterns to indicate processing intent: series of rectangles for colour negative and “+” symbols for colour reversal. Colour sealing bands for colour films; black-and-white films have distinct sealing bands and no process-edge patterns.
- Packaging and labelling
- Minimum package markings (product name/size, manufacturer ID, storage/processing conditions, batch/expiry or inventory codes) to support correct handling and photofinishing.
Applications
- Manufacturers of 120- and 220-format film and spools use ISO 732:2000 to ensure product interchangeability and camera compatibility.
- Camera designers and retrofitting services rely on spool and register-mark specifications for reliable film transport and metering.
- Photofinishing labs use the standardized edge markings to route films to the correct processing chemistry and workflow.
- Quality assurance, packaging, and supply-chain teams use the labelling and thickness requirements to maintain light-tightness, handling safety, and inventory control.
Related Standards
Keywords: ISO 732:2000, 120-size film, 220-size film, film spool dimensions, backing paper, leader paper, paster tape, photofinishing markings, photography standards.
