01-12-2013, 02:32 AM
It would work in a straight up auto mode (or manual too) but TTL features would not work. When the flash is in auto exposure it just reads light reflected back from the subject to a sensor eye on the flash unit. In TTL the light reflected back is read through the lens (TTL) by a sensor at the film plane. Many flashes are not even compatible in TTL or other advanced modes even within the same brand.