they take a dim view on red light camera fines
in vic, you can have a fine withdrawn and replaced by an official warning, but generally not for red light cameras, talking on phone and other serious offences
they may let you off on a red light camera in vic, but it seems only in some circumstances
http://www.police.vic.gov.au/content...ument_id=10369
here is the link. obviously if you are not in victoria, it doesn't help anyway, but it may give you an idea on what you are up against
personally, with the limited knowledge i have, if you missed it by over half a second, i would not fight it. by all means, ask the relevant questions before paying, but i don't think i would risk going to court for it