Last night I was trying some outdoor long exposure picture taking and noticed something odd while looking through the viewfinder.
When I had the shutter button half pressed, I noticed the scene in the viewfinder started to drift.
It went from being in the centre of the viewfinder to moving over and up to the left. I know that sounds weird but, that's the best way I can describe it.
After I let go of the shutter button and the camera stopped trying to evaluate the scene, the scene image moved back into the centre of the viewfinder.
At first I thought I was moving the camera or tripod somehow but then, made sure I was doing neither and, it still happened.
I had the camera in manual mode, and was manually doing the focus.
I had the focus set before half pressing the shutter button.
Also have the camera set to back button focus and was not pressing that button.
I forgot to turn off the lens IS while taking some of the pictures but, I'm pretty sure the same thing was happening after turning off the IS.
I haven't downloaded any of the pictures yet and they look OK when reviewed on the camera.
The camera is a Canon 40D.
Is what I've described, normal?
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