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I dont shoot much indoor with flash but shot an event recently that required flash and had trouble shooting in Av mode. The fastest shutter I could get was of 1.5sec. ...What am I missing or does camera/flash need to be serviced?
As mentioned above, that's how Av Mode is designed to work on Canon cameras; it normally will set the shutter speed needed to properly expose the background, with the flash acting as either key or fill on the subject.
You can, however, change the operation with Custom Function I-7 on the 5D Mark II (and 7D):
0 = Automatic Shutter Speed. This is the default mode.
1 = Automatic Shutter Speed With Limits; 1/200 (1/250) - 1/60.
2 = Fixed Shutter Speed at 1/200 (1/250).
On the original 5D, it's Custom Function 03, and there are only two choices:
0 = Automatic Shutter Speed.
1 = Fixed Shutter Speed at 1/200.
...I read manuals for both flash and camera and couldnt figure out what setting I am missing.
On the 5D Mark II it's on page 194 of the Instruction Manual, and for the original 5D it's on page 151.
I use setting 1 most of the time, unless I'm doing a formal portrait and have a tripod; then I'll use 0...or more likely full Manual mode.