GB/T 10072-2025 Specifications of electronic flash equipments for photograph English, Anglais, Englisch, Inglés, えいご
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ICS 37.040.10 CCS N 46
People's Republic of China National Standard
GB/T 10072-2025 Replaces GB/T 10072-2003
Specifications of Electronic Flash Equipment for Photograph
Issued on August 29, 2025
Implemented on March 1, 2026
Issued by the State Administration for Market Regulation
Standardization Administration of China
Contents
Foreword
1 Scope
2 Normative References
3 Terms and Definitions
4 Abbreviations
5 Technical Requirements
6 Test Methods
7 Inspection Rules
8 Marking, Packaging, Transportation, and Storage
Specifications of Electronic Flash Equipment for Photograph
1 Scope
This document specifies the technical requirements for electronic flash equipment used in photography, describes the corresponding test methods, and stipulates inspection rules, marking, packaging, transportation, and storage.
This document applies to the manufacture of external electronic flash equipment designed to provide primary or supplementary light for camera photography.
This document does not apply to high-power studio flash equipment.
2 Normative References
The following documents contain provisions that, through reference in this text, constitute essential requirements for this document. For dated references, only the edition cited applies; for undated references, the latest edition (including all amendments) applies.
GB/T 13987—2025 Determination of Guide Number for Electronic Flash Equipment Used in Photography
JB/T 13702.1 Environmental Test for Cameras—Part 1: High and Low Temperature Test
JB/T 13702.2 Environmental Test for Cameras—Part 2: Vibration Test
JB/T 13702.3 Environmental Test for Cameras—Part 3: Impact Test
JB/T 13702.5 Environmental Test for Cameras—Part 5: Free Fall Test
JB/T 14302 Conditions and Test Methods for Packaging, Transportation, and Storage of Photographic Machinery
3 Terms and Definitions
Terms and definitions defined in GB/T 13987—2025 and the following apply to this document.
3.1 Light Output
The integral of the luminous intensity over time in the direction of the reflector axis.
Note: The unit of light output is candela second (cd·s).
3.2 Ready Indication
The indication signal when the flash equipment is charged and ready to flash.
3.3 Guide Number (GN)
The product of the camera lens aperture number (F-number) and the distance from the flash light source to the subject, required to achieve proper exposure for the film or digital camera sensor, related to the ISO sensitivity of the film or digital camera.
Note: The guide number is a measure of the light output of the flash unit, with the unit being meter (m).
[Source: GB/T 13987—2025, 3.1]
3.4 Ready Number
The GN measured when the ready indication (3.2) begins to display.
3.5 Effective Angle of Coverage
The angle between the reflector axis and the beam where the luminous intensity is half the axial intensity.
Note: For symmetrical reflectors, the effective angle of coverage is twice the effective half-angle. For flash equipment emitting rectangular beams, the effective angle of coverage is defined by the horizontal and vertical angles.
3.6 Recycle Time
The interval between the flash release and the start of the next ready indication.
3.7 Number of Flashes per Battery Set
The number of consecutive flashes the flash equipment can perform under specified working cycles until the ready indication no longer appears within 60 seconds.
3.8 Automatic Adjustment Mode
The mode where the light output of the flash equipment is controlled using the metering system on the flash equipment.
3.9 TTL Metering and Light Adjustment Mode
The mode where the light output of the flash equipment is controlled using the metering system that measures light through the camera lens.
3.10 Effective Distance of AF Supplementary Light
The maximum effective distance at which the camera can achieve correct focus solely relying on the AF supplementary light emitted by the flash equipment.
3.11 Special Function Contact
The contacts in the connection between the flash equipment and the camera, other than the contacts used to trigger the flash, which can enable certain specific functions.
3.12 Relative Color Temperature
The temperature of a black body when the color of the light emitted by the light source matches the color of the black body's radiation at that temperature.
4 Abbreviations
The following abbreviations apply to this document.
AF: Auto Focus
TTL: Through The Lens
