Where's this safety shift found and how does one turn it off?
I don't think that's the problem, but I'd like to know anyway. It can't be Safety Shift because my research indicates SShift...
1. only works in Av and Tv, not Manual, and
2. in Av it changes the aperture, not the shutter speed.
It's not because of the flash synch speed. I was setting to no faster than 1/125; and the camera was changing the setting to between 1/13 and 1/60. This was a low light situation (an indoor dance party), and I was dragging the shutter as much as I could without getting too much motion blur.
I failed to mention, however, I have the Canon BG-E9 Battery Grip on this camera. I'm not used to a battery grip camera. It just occurred to me to wonder if I was inadvertently turning the control wheel on it with my pinkie finger. That would change the shutter speed.
Is there a way to disable that wheel?