Just to clarify something. If you're commissioning a photographer for commercial purposes, then you are unlikely to be employing them, and therefore the point suggested in a (now closed) topic, is that you do not automatically "get" the copyright.

If anyone wants to to know the facts, the Australian Copyright Council, put on many information seminars around the country, and the correct information, can be sourced from www.copyright.org.au/ Which btw is a nice new site.