I have owned an EF since new (1974). About a dozen years ago I decided to use it since I had gotten away from photography for a few years other than family snapshots. I discovered that the electronic shutter speeds (two seconds to thirty seconds) no longer worked. The shutter would open and stay opened. After fooling with it for 15 or 20 minutes, could get it to close. The mechanical speeds (one second to 1/1000th) appeared to work. Honestly, I can not remember if I noticed if the meter was responding. I sent it to, I think ACR, and after evaluating it, they told me the CPU had failed and was no longer available. I had them replace the seals, clean it out a bit and return it to me. I have two other Canons - an FTb bought new (1972) and a perfect AE1 Program I inherited. I had both re-sealed and CLA'd. So I am not out of business. I put the EF in my display case with my small collection of non-user cameras and went on to use the others. But, damn, I miss using the EF and, recently, I got it back out. I have read about people who have them and I have not read of anyone having similar problems. And most seem to have bought them used. I know I can use it manually. The question is has anyone had this problem with his or her EF?