BS 5550-2.7.2:1982
Current
The latest, up-to-date edition.
Cinematography. 16 mm film. Projection Specification for the performance of 16 mm sound-film projectors
Hardcopy , PDF
English
30-07-1982
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Foreword
Cooperating organizations
Section one. General
1 Scope
2 References
3 Definitions
4 Instruction manual and marking
Section two. Design and construction
5 Design
6 Speed of projection
7 Projector lens assembly
8 Accessibility of optical and other parts for
cleaning
9 Picture aperture
10 Framing and tilt
11 Picture-sound separation
12 Electrical and safety requirements
13 Light source
14 Lamphouse ventilation
15 Optional facilities
Section three. Picture performance
16 General
17 Preliminary setting up
18 Light output
19 Distribution of screen illumination
20 Colour bands in the image
21 Picture steadiness
22 Travel-ghost
23 Image resolution
24 Alignment and position of film plane
25 Flicker
Section four. Sound performance
26 General
27 Projectors with photographic sound systems
28 Projectors with magnetic sound systems
29 Amplifier
Section five. Mechanical tests with film
30 Test requirements
31 Test film
32 Loop tests
33 Fast winding without unthreading tests
34 Feed, reverse, still-picture, take-up and rewind
tests
35 Loop reformer test
Appendices
A Requirements specific to projectors with discharge
lamps
B Alternative picture unsteadiness test film
C Weighting network for measurement of amplifier noise
with projector not running
D Measurement of photographic sound system noise
E Test of erasure efficiency
F Test of the total system signal-to-noise ratio
G Warning symbol
Tables
1 Signal-to-noise ratios for projectors with magnetic
sound systems
2 Amplifier characteristics
3 Take-up and rewinding
4 Reverse take-up
5 Perforation strain
6 Perforation strain, reverse take-up
7 Change of direction while running test
Figures
1 Light output
2 Distribution of screen illumination
3 Warning symbol
4 Weighting curve A
5 Cut-outs for loop reformer test
Performance requirements for projectors both for normal picture projection and in telecine operation. Does not apply to film mechanisms specifically designed for telecine operation.
| Committee |
CPW/36
|
| DevelopmentNote |
Supersedes BS 3675(1963) (11/2004) Supersedes 79/65557 DC. (08/2005) Reviewed and confirmed by BSI, December 2009. (11/2009)
|
| DocumentType |
Standard
|
| Pages |
24
|
| PublisherName |
British Standards Institution
|
| Status |
Current
|
| Supersedes |
This British Standard specifies requirements for 16 mm sound-film projectors both for normal picture projection and in telecine channels. This standard does not apply to film mechanisms specifically designed for telecine operation.
It specifies requirements intended to ensure a satisfactory picture and sound performance, safety and film life. It does not deal with the details of the mechanical and electrical design and construction of projectors except in so far as such details may affect performance, safety or convenience in use.
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| BS 5550-2.7.1:1986 | Cinematography. 16 mm film. Projection Specification for projector usage of 16 mm motion-picture films for direct front projection |
| BS 5550-2.9.1:1978 | Cinematography. 16 mm film. Projector spools Specification for dimensions of spools for 16 mm motion-picture projectors (up to and including 120 m capacity: 18 cm size) |
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| BS 5550-2.2.3:1980 | Cinematography. 16 mm film. Image areas. Specification for positions and dimensions of picture image area and photographic sound record on 16 mm motion-picture release prints |
| BS 5550-2.2.2:1978 | Cinematography. 16 mm film. Image areas Specification for dimensions and location of the projectable image area on 16 mm motion-picture prints |
| BS 5550-2.9.3:1980 | Cinematography. 16 mm film. Projector spools Specification for 16 mm film spools of 732 m capacity (43 cm size) for specialized equipment |
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| BS 5550-2.9.2:1980 | Cinematography. 16 mm film. Projector spools Specification for spools for 16 mm motion-picture projectors (from 244 m to 610 m capacity: 24 cm to 38 cm size) |
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| BS 5550-2.1.1:1984 | Cinematography. 16 mm film. Raw stock Specification for dimensions of 16 mm motion-picture film |
| BS 3861-2:1968 | Electrical safety of office machines. Requirements and tests for machines presenting special hazards |
| BS 5550-2.4.6:1979 | Cinematography. 16 mm film. Sound Specification for positions and width dimensions of magnetic stripes and magnetic recording head gaps for sound record on 16 mm motion-picture film perforated along one edge (Type 1) |
| BS 5550-7.2.2:1978 | Cinematography. Production and presentation. Screens and screenluminance Recommendations for screen luminance for the projection of 16 mm film |
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