The Canon Off Camera Shoe Cord 2 maintains all on-camera flash functions (including E-TTL) for one Canon Speedlite used off-camera at distances up to 2 ft. (60 cm).  It is compatible with all Canon EOS cameras except the 630 and RT(which require a combination of TTL Hot Shoe Adapter 3, OA-2 Off Camera Shoe Adapter & Connecting Cord 60).  It is also fully functional with the combination of the T90 camera and 300TL flash(from Canon's older FD manual focus system). 

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