Alex,
First, use the Off Camera Shoe for the flash to ensure it fires. The ST-e2 is great but unless you are in a closed room the flash pulse from the STE2 may not be received by the flash so you may miss a shot. The STE2 transmits a short pulse which can bounce off walls, celings, etc. For outdoor shots you need to put the flash in front of the STE2 with the front turned backward (the 550EX can twist easily enough to allow this) facing the STE2. Now, your question on the AV mode, the reason you should not use it is that in low light the shutter speed will be too slow. It does not automatically go to 1/60 sync speed. Peter K * **** ******* *********************************************************** * For list instructions, including unsubscribe, see: * http://www.a1.nl/phomepag/markerink/eos_list.htm ***********************************************************
