Hello all. Not sure if this is the right place to post this but since I just bought a new Canon 70D, I'll try it here first. I used to have a T2i. I use an external flash, oloong SP-690, since the internal flash wasn't strong enough for my taste and it worked fine. I sold my T2i to a friend but kept the flash since I didn't want to buy another one. Well for some reason, the flash doesn't sync up with the camera when in the hot shoe in TTL mode (the pictures are dark) and won't even fire when the flash is on manual mode. The flash works fine as an external (light). It would work in S1 mode. I took some shots in front of a mirror using the internal flash and I could see in the picture the flash trigger. But when I put the oloong 690 speedlight on the hot shoe, I could see the flash trigger but in the picture, it's not there. I tried all the settings I can find and still no luck. Whenever I press the shutter button, the flash is either late or early. I don't have another external flash to test so I'm just wondering if it's the flash or the camera hot shoe. Oh ya, I already cleaned all the terminals so it's not bad contacts. Please help. Thanks.