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I presume that the first pressure on the trigger is to let the camera set the distance? Or is that already locked to infinity?
So far as I have sussed it out, by reading the User Manual:
If I use the camera in full AUTO mode, when I half-press the trigger the camera has to make five decisions. Focus, Aperture, Exposure time, White Balance and ISO speed. White Balance takes account of the ambient light colour (daylight, fluorescent etc.) and ISO speed is the sensitivity of the retina, which can be increased in poor light. I preset the focus and Exposure time ("Fast train coming!") but the camera still has to set the rest.
I suspect some of this goes on unseen in a simpler Point and Shoot Camera, needed to match the flexibility of film. "Point and Shoot" because there are only two ways to get it wrong - point it the wrong way and shoot at the wrong time. The G6 is a "Creative Compact" camera, which means there are many more creative ways to get it wrong.
Regards,
Harold J Curnow (UK)