Canon 300D & Quantaray QBT 9500 TTL Flash

I resently used a the above combo in TTl mode using a 200th Sec shutter speed (which is the max sync speed for that camera) and my photos came out over exposed in the P mode. IE camers set in P mode I manually selected the shutter speed of 1/200th, the flash was in TTL auto mode. And all shots came out over exposed. I wasn't able to chimp in between shots so I didn't catch what happened until later. It was my first attempt to use a max sync speed as I just learned about it as my photography education was back in the 70's and then everything was 1/60th sec for flash and I have always used that when using a flash, but I just read an article on max sync speeds and read in the manual that for the 300D it was 1/200th sec. So I figured that if I set the speed to that then the ttl would tell the camera to use the correct apature vale for the shot. I figured if anything ewhen wrong the shots would be under exposed due tio the faster shuttler speed. but the reversed happened and the shots were overexposed by several stops. I haven't had the chance to shoot any more using the ttl mode and the max sync speed . SO what happened?

Possibly that flash unit isn't compatible with your camera.

The TTL metering systems used with film cameras are completely different from the E-TTL metering system of EOS digital cameras. You may want to do some research to see if your flash is E-TTL compatible.

Curtis is right that flash only works in manual mode.

your going to have to set the exposure yourself.

Bob

How do you manually select shutter speed in P mode? From my understanding, you can only shift the Av value with flash turn on in P mode, but not shutter speed.

If the camera doesn't recognize the flash (which is probably the case), P mode will behave as though there is no flash attached.

No the flash has a module/adapter designed for the EOS AF cameras. Plus modules for different other cameras. I have the CN for the AE-1P and a slave for using it off camera. So that should not be the answer.

Even older Canon Speedlites (prior to the EX series) are not compatible with Canon digital cameras. The camera may recognize the flash, but those units aren't capable of firing the E-TTL pre-flash. If they work at all, they fire full power.

The flash is designed for the digital cameras, it used to work correctly but last few times I used it blew out everything.

If it did work before and it doesn't work now then the most likely route to take is to take a test shot now then see if it is still a problem. If it is still a problem then take the module off and then reinstall it back on to the flash and retest. Sometime the contact is not making and then the eTTL won't work. Check also to see if all the pins on the bottom of the hotshoe is fully extended.