I seems to be getting inconsistent focus with this combo.
Say I've focused on a flat object (IE brick wall, shed etc) from about 10m away using centre spot. If I watch the focus markings on the lens almost every time I half press the shutter the focus shifts by a mm or two back and forth.
Is this normal?
The reason this came about was when I was simply focusing with the viewfinder then switching to live view and zooming into 10x to check it was spot-on, in almost every example I had to readjust.
I played around with microadjustment and although this did improve things when set to +2, it was still totally inconsistent, yet in EVERY situation I used auto focus in live view (set to 10x) it was perfect.
I know the 7D is notorious for user error, but I really can't see I'm doing anything wrong.....?