Hi Richard,
You might try
http://www.company7.com/
They do deal with Australians.
They supplied my Questar and were very helpful. I do have a camera adapter for my Canon camera. In reality a set of fittings which have to be combined. Martin Cohen at Company 7 is a genuine expert but like Questar itself they seem to prefer a phone call. However once assured I am basically deaf we managed by email quite happily.