Canon EOS 1D MK11

[ABBOTALE]

The camera was working fine as my backup camera THEN over night it wont focus in AF? Viefinder is sharp but photos blurred it has the same settings as my 1DS M11 so i dont know Does the CMOS Battery have any effect it hasn't been dropped or knocked ..

[ebiggs1]

"...could it be an accidental diopter adjustment?"

I rather doubt it.  If the diopter is maladjusted nothing would be clear.  OP claims good focus through the viewfinder.

[ebiggs1]

Other than the AF, it is working OK?