Anybody know what Err 01 on the 1DmkII is? I was only getting it with the 70-200 f2.8L IS lens. Strange to get this now after 2-1/2 years of trouble free service with this lens.
The aperture reading kept saying 00, and the camera would hang with the mirror up until I turned off the camera. I checked and cleaned the contacts, checked the switches on the barrel, and I kept getting the intermittent hangups. I switched batteries, changed and formated the SD cards, all to no avail. I shot a bunch with the 28-70 f2.8L, no problems at all. I'm wondering if there is a short with the IS lens? Any input greatly appreciated.