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JB/T 8248.2-2025Measurement of Photographic Lens Characteristics - Part 2: Measurement of Effective Aperture and Relative Aperture (English PDF)

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Issued by

Ministry of Industry and Information Technology

Level / Type

National · Recommended

Issue date

August 19, 2025

Implementation date

March 1, 2026

Scope

JB/T 8248.2-2025 (Measurement of Photographic Lens Characteristics - Part 2: Measurement of Effective Aperture and Relative Aperture) is available as an English-translated PDF.

JB/T 8248.2-2025 — This standard specifies the measurement method for the effective aperture of a photographic lens and the calculation method for its relative aperture, and specifies the requirements for recording measurement values.

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Document preview — JB/T 8248.2-2025

National Standard of the People's Republic of China

ICS: 37.040.10
Classification: N 43
Replacing: JB/T 8248.2-1999

Issued by: Ministry of Industry and Information Technology

What this standard covers1
Document data2

What this standard covers

This standard specifies the measurement method for the effective aperture of a photographic lens and the calculation method for its relative aperture, and specifies the requirements for recording measurement values. This standard applies to the measurement activities of the effective aperture and relative aperture of photographic lenses.

Document data

International classification (ICS): 37.040.10.

Chinese classification (CCS): N43.

Supersedes the earlier edition JB/T 8248.2-1999.

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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — all pages — is available in the English PDF.

Referenced standards

Cited by

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