I have a Canon 60D. I've had it for a month now. Today while taking pictures I noticed that if I take a picture in AV Priority, the shutter speed is really slow. So I took a picture in Auto and noted the shutter speed ( 1/60 ), ISO ( 400 ), and aperture ( 4.0 ). Then I switched to AV and on the same shot set my aperture to 4.0 and the ISO was on 400, but the shutter speed was set to 1/6 not 1/60. I uploaded the raws to my computer and reviewed the settings and it seems everything else is the same. Just trying to find a reason for this. My assumption is that the settings to get the proper exposure between modes shouldn't matter - at least between AV and auto - when taking the same shot. I also noticed that something is different in the shot - perhaps the white balance, but that is set on auto as well. Thanks.
So I tried again comparing P and Av. I had similar results. I'm on my phone, so these images are from the info screen on the camera.