Can we leave our thoughts as a photograph?\r\nHow much quantity of time do we need for that?\r\n\r\nA single-lens reflex camera is a tool for expressing scenery.\r\nSensitivity of human being has an infinite possibility.\r\n\r\nThe sight recorded as a photograph also has an infinite expression.\r\n\r\nSo many lenses are made day after day.\r\nWhy? What is its purpose?