In order to capture a rare moment on film, a photographer must most importantly possess which compositional skill

The compositional skill a photographer must possess to capture a rare moment on film is timing. Timing is crucial in photography as it allows the photographer to capture the exact moment when all the elements come together in the frame to create a captivating and unforgettable image. Being able to anticipate and react quickly to capture fleeting moments is essential in photography, especially when trying to capture rare or unique moments.