EOS 550ex vs 420ex

[Avraham Mark Jacobs]

Can anyone give me a run down of the differences in features between these two
flashes?

TIA
Avie Jacobs

*
****
*******
***********************************************************
*  For list instructions, including unsubscribe, see:
*    http://www.a1.nl/phomepag/markerink/eos_list.htm
***********************************************************