Overview
ISO 28:1976 - "Cinematography - Camera usage of 8 mm Type R motion‑picture film - Specifications" provides camera-side specifications for 8 mm Type R motion‑picture raw stock. Published in 1976 by ISO/TC 36 (Cinematography), this International Standard replaces ISO Recommendation R 28‑1956 and defines how 8 mm Type R film should be handled and exposed in motion‑picture cameras to ensure consistent image orientation, emulsion positioning and frame‑rate compatibility with projection and sound systems.
Key Topics and Technical Requirements
- Emulsion orientation and image area: Specifies the position of the emulsion and the photographic area to be exposed for both single and double 8 mm Type R raw stock; figures illustrate film as seen from inside the camera looking toward the lens.
- Frame rate (frames per second):
- For film not used for sound: normally 16–18 fps or 24 fps, depending on intended use.
- For film containing a sound record (photographic or magnetic): 24 fps, or 25 fps in regions using 50 Hz mains (television areas).
- Exception: films photographed at 18 fps with post‑process recorded magnetic sound should be projected at 18 fps.
- Note: special "no sound" films (e.g., time‑lapse or high‑speed) may be shot at other rates, but the intended projection rate should be recorded.
- Single vs. double 8 mm: Illustrative guidance for single and double 8 mm Type R formats, including direction of film travel and image‑forming side.
- Cross references: Points users to related standards such as ISO 29 (projector usage), ISO 74 (camera aperture and projectable image area), and ISO 486 (perforation/cutting for 8 mm).
Applications and Who Uses It
- Cinematographers and camera operators: for correct loading and framing of 8 mm Type R film in cameras.
- Camera and equipment manufacturers: to design camera transport, pressure plates, and guides compatible with ISO orientation and film travel.
- Post‑production and projection technicians: to match recorded frame rates and sound formats for accurate playback and synchronization.
- Archives, film labs and restorers: to document original shooting parameters and ensure faithful projection or transfer to digital formats.
- Broadcasters and transfer services: to select the correct target frame rate (24 vs 25 fps) when preparing film for television systems.
Related Standards
- ISO 29 - Projector usage of 8 mm motion‑picture film (in preparation/revision)
- ISO 74 - Image area produced by 8 mm Type R camera aperture and projectable image area (in preparation/revision)
- ISO 486 - 16 mm motion‑picture film perforations and cutting (relevant for related perforation specs)
This standard remains a practical reference for anyone working with 8 mm Type R motion‑picture film to ensure consistent exposure, orientation and frame‑rate compatibility across capture, sound recording and projection workflows.
