Allows keeping same subject size in the LCD monitor as if you were at 1cm from the subject. Rear male base screw 46mm. Allows a 1/1 ratio at 20cm from the subject.
Driven by a love of the sea and its largest fish, the elusive whale shark, Australian naturalist Brad Norman has received a Rolex Award for Enterprise for creating a worldwide photo-identification system which enables ordinary people to assist in its conservation.