DIN ISO 517-2009 摄影技术 照相机镜头光圈及其相关特性 名称和测量法

标准号：DIN ISO 517-2009
中文标准名称：摄影技术 照相机镜头光圈及其相关特性 名称和测量法
英文标准名称：Photography - Apertures and related properties pertaining to photographic lenses - Designations and measurements (ISO 517:2008); English version of DIN ISO 517:2009-05
标准类型：A15
发布日期：1999/12/31 12:00:00
实施日期：1999/12/31 12:00:00
中国标准分类号：A15
国际标准分类号：37.040.10
适用范围：This International Standard pertains to apertures and related properties of photographic lenses affecting theilluminance at the centre of the image.This International Standard specifies aperture markings for all types of lenses used in still cameras, and givestolerances for the stop numbers. It also defines aperture stop, entrance pupil, focal length, relative apertureand 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 thefocal length of the lens.