I have a canon canonette and an olympus 35rc and wanted a single flash for both as I don't use flash enough for either to warrant one a piece. I'm looking at a sunpak 383 auto. It has the bounce and swivel features that I like. It doesn't have TTL but it's own auto feature which, unless I'm misunderstanding this, means that the strength of the flash is something that the flash determines itself without input from the camera which means it can be used interchangeably on different brands of cameras. Is that right?