Is it true that using extension cord will render E-TTL useless for canon camera?
If so, is it more worth to get the 540EZ. Although price of 540EZ and Sigma 500 Super DG are quite close, and that Sigma comes with E-TTL, it does not have AF assist light for the side sensors? Also, you have to disable the E-TTL when using slave, else the pre-flash will activate the slave?
Thought of getting 550EX, very $$$, next Sigma, but not side AF assist.
For the problem face when slaving flash and the side AF assist problem, also the problem with extension cord. Is it worth to even consider to get the 550EX and Sigma??
Pls advice if the problems stated are true. I think the info will help alot of fellow CS to make up their mind. Thanks.