When using my cannon Speedlite 580EX II unit on my 7d or 50d cameras the read out is constant flashi

[SusanK]

1. Check that the angle of the flash head is not at it's maximum;

2. Make sure that the white card and diffuser ar pushed all the way in.

[beebear7]

Thank 'u' very much. It working now.   Still learning.