【摘要】 自然光是摄影， 尤其是地理摄影或业余摄影利用的主要光源自然光主要是太阳光， 充分认识太阳光的照明特征是分析太阳光在地球表面照度变化的基础对于地球表面的被摄体而言， 影响太阳光照度的基本因素主要表现在天气变化、时间早晚、季节变更、投射方向、地域变迁、环境明暗等六个方面这些影响因素虽然都比较复杂， 但也都富有极强的规律性了解影响太阳光地表照度的基本因素对曝光控制十分有益更多还原

【Abstract】 The light of nature is the primary lamp-house in photography,especially in geography photography and amateur photography.The light of nature is mostly the sunlight whose lighting characters must be fully understood to analyze the change of the sunlight’s illuminance on the earth’s surface.The basic factors influencing the sunlight’s illuminance include the weather,the time,the season,the shining direction,the clime,the brightness,etc.Though these factors are complicated,there are laws to be found.It is very useful understanding these factors.更多还原