Hi all, I'm a noob at flash photography but finally getting into it.

I've been reading posts on which flashgun to get, and am interested to get either a Nissin or Yongnuo to start with. However, as I have two cameras, one a Canon 450D, and the other an older Canon film slr (EOS 500), I'm concerned about sync-ing issues with the latter.

Will any flashgun sync properly with older film cameras? How do I know if it will? Can anybody help?

Thanks in advance!