BS ISO 517:2008
Photography. Apertures and related properties pertaining to photographic lenses. Designations and measurements
Photography. Apertures and related properties pertaining to photographic lenses. Designations and measurements
- Статус документа:
- D
- Формат:
- Электронный (PDF)
- Дата публикации:
- 30 июня 2008 г.
- ICS:
- 37.040.10
- SKU:
- BS ISO 517:2008
Abstract
1 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 determination. This International Standard applies only to lenses focused on objects at infinity; that is, at least 50 times the focal length of the lens.
Похожие стандарты
Другие стандарты BS
BS ISO 10835:2007
ДействующийDirect reduced iron and hot briquetted iron. Sampling and sample preparation.
1 Scope This International Standard gives a) the underlying theory, b) the basic principles for sampling and preparation of samples , and c) the basic requirements for the design, installation and op…