Todd up with the Olympic greats

A portrait of double gold medallist Mark Todd is among 38 chosen for an exhibition of the world's greatest Olympians as part of the Games.

The equestrian three-day eventing rider is pictured with his son on his shoulders at the Cambridge racetrack, near his NZ property.

The portraits, on display at the Chifley Plaza, come from an original set of 80 black-and-white images that make up the Visa Olympic Photographic Collection.