Single-point AF for this slow-gliding swan enables you to keep autofocus locked on the bird’s head.
SINGLE-POINT AF
■Mid-range DSLRs including the D7500 and D780 have a 51-point phasedetection autofocus module, whereas it’s as much as 153 AF points for the D850. Z-system mirrorless cameras have between 209 and 493 AF points, spread out across most of the image sensor. However, single-point AF is only really suitable for tracking if the subject is moving slowly and very predictably.