（photo / pexels.com） Framing the Picture■ Light enters the lens. ■ Light bounces of reflex mirror and through pentaprism to viewfinder. ■ Photographer sees what the camera sees through the viewfinder. 内容选自国家地理出品《Guide to Photography: Photography Basics》原文链接：https://www.nationalgeographic.com/content/dam/ngdotcom/rights-exempt/NatGeo_GuideToPhotography.pdf