The F-stop, additionally referred to as the aperture, describes the quantity of light that is let right into the electronic camera while taking a photo. Comprehend the scientific research behind the various F-stops with tips from a specialist photographer in this free video on cam settings. Specialist: Rebecca Guenther Contact: www.m5a1photography.com/. Biography: Rebecca Guenther is a photographer living in Austin, Texas. Filmmaker: Todd Environment-friendly.