Photography. Apertures and related properties pertaining to photographic lenses. Designations and measurements1 Scope This International Standard pertains to apertures and related properties of photographic lenses affecting the illuminance at the centre of the image. This International Standard specifies aperture markings for all types of lenses used in still cameras, and gives tolerances for the stop numbers. It also defines aperture stop, entrance pupil, focal length, relative aperture and stop numbers, and gives methods for their measurement or

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either by being positioned in them or adjacent to them

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The main changes compared to ISO 8579‑2:1993 are as follows

A new Annex B on common substrate panel has been added

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BS EN 50526-3 provides for the application guide to ensure the selection and proper installation of D

ISO 12687 specifies test techniques for detecting flaws and porosity in metallic coatings

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For any infrastructure project

Using ISO 18168 guidelines