The Photographer's Telephoto Trick · AI Generator #GEN-97C243D0
Physics · optics
Problem
A wildlife photographer is using a telephoto lens to photograph a bird perched on a branch. The lens has a focal length of f=300mm and is currently focused at infinity. The bird is actually located d=50m away from the lens. To get a sharp image, the photographer needs to extend the lens by moving the image sensor (or film plane) further from the lens elements. By how much must the sensor be moved outward from its current position to bring the bird into sharp focus?