> This statement confuses me. I have 2 550EXs and an STE2. I can use one > 550EX on camera and set another 550EX as a wireless slave (so I do not > need the STE2). If I use the STE2 I can use both 550EXs wirelessly. How > does the EF500 Super operate differently from the 550EX that it would > not require another a flash or the STE2 to trigger it?
Hi Peter, Good question. The answers are not immediately apparent, hence the document at EOSDOC: http://eosdoc.com/manuals.asp?q=ETTLDx The Sigma EF 500 Super can be set to non-ETTL slave mode. This means that it will trigger on a single, uncoded optical pulse, just like having a simple HAMA hotshoe optical slave trigger mounted on the hotshoe, or a Wein peanut in the PC socket of a studio strobe. It does require another flash to trigger it, but the signal is not coded with channel or group information. You can trigger it by pushing the Test Button on another flash, or by using the (TTL) popup flash on your EOS camera. If you have an E-TTL flash for master, you will need to do an additional step to prevent the E-TTL preflash from setting off The slave is sensitive to Infrared light, so applying an IR filter made from processed unfogged slide film gives another option for lighting control. Cheers Julian Loke * **** ******* *********************************************************** * For list instructions, including unsubscribe, see: * http://www.a1.nl/phomepag/markerink/eos_list.htm ***********************************************************
