When it comes to infrared photography, friends who played with cameras a few years earlier might immediately think of the F707. Equipped with Sony's unique NightShot mode, it can capture the infrared images of objects, providing not only an all-new visual experience but also raising a sensitive topic - "seeing through". Due to this "seeing-through" function, the 49mm口径 (49mm) infrared filter applicable for F707 suddenly became highly sought-after, akin to the idiom 'the paper becomes expensive in Luoyang' which describes something rare becoming extremely valuable due to demand.