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Those are great photos. I also have recently purchased a G9, but have not been able to get it wet yet. Do you mine sharing your camera settings that you used?
Sure
At first I couldn't fire the YS external strobe head with the slave, so I used the fiber optic cable, and rigged it to the Canon flash diffuser, then it always seemed to fire. I had the external strobe set to around 1/2 power, and straight w/o the diffuser.
External head about 6-7 inches above lens.
How are the controls accessibility on the Canon housing ?