I noticed a few days ago that while taking shots with my
40D using the 85 1.2 II that the battery would die after about 5 minutes of use so I put a fresh battery in and after a few minutes the battery would die.I also noticed that the battery that was charging would be fully charged in less than 5 minutes.So I tried the 70-200 2.8 IS and no problems and I had also use this combination with a hockey game a few days before (70-200) for an hour and a half and was problem free.So last night I placed the 85mm back on and after a few minutes the battery died again but this time I just turned the power off on the camera and then turned it back on and the battery was showing up as fully charged.Thants why it only took 5 minutes to charge.I will be checking this in a few days using a freinds 40D.
That is so strange. I tested mine last night without any troubles. Oh yeah, and I hadn't charged my battery in several days.
Does this happen in one shot or just AI servo? How old is your 85L? I have seen a couple of comments on this problem and the posters said their lens was at least a year old.
Seems like the 85 has a high-resistance electrical fault that is draining power from the camera too fast and causing the camera to report low battery voltage but not causing it to see a "fault" and shut down power to the lens and/or camera immediately. If that is so then you can expect it to happen on any other camera too, or at least on any other 40D that has the same electrical characteristics.
Li-ion batteries have a built-in microprocessor to safeguard the cells by limiting maximum voltage and by protecting against deep discharge, short circuit and overload. So what is happening is likely due to fault in the USM motor in the lens creating an overload and the protection in the battery is simply trying to save itself from harm. Before doing doing any more experimenting with your Li-ion batteries you might want to watch this which shows what can happen when a Li-ion battery is overloaded: http://www.youtube.com/watch?v=jjAtBiTSsK
As I have reported, this exact same thing has happened with my 40D and 85L. Strange, that when I contacted Canon, no one seemed to have ever heard of this happening to anyone else and now it seems to be happening" frequently" with others also. Canon can't or doesn't want to get many if any things right lately.
Any credence to having the need to have the lens serviced? Chuck mentioned that it might be the lens being the culprit, but I dont see it happening with the 20d, nor 5d.
Edited by njjuliano on Mar 03, 2008 at 04:04 PM GMT
Changed battery types on the grip.
Checked for play in the lens mount.
Is it the cam, or the lens? It doesnt happen in the 20d. But no other lens makes this happen on the 40d.
Still cant find a definitive answer at this point.
I don't have a suggestion, just a question to go along with this. Last night, my XT did this on a fully charged battery. It was on AI Servo mode, so when the camera shut off, I took out the battery and put it back in, turned it on and put it on One Shot. Could the AI Servo mode have something to do with it?
I just got back from a 2 week vacation didnt use the combination.I did try my buddies 40D on my 85mm befroe I left and had no problems.So as of now it looks like the camera.I used the 85 on a Mark IIn many times with no problems
^Thanks for the links, I hear the 50D may be similarly afflicted
It's such a shame that one of Canon's top lens can be impaired in such a fashion on some xxD bodies (not all 40D or 50D models are affected though)
Canon Australia told me that Canon Japan had issued an internal service note/memo acknowledging the problem and currently investigating so if anyone tells you "We've never heard of a problem" they are either lying or ill informed...in which case why do they still have a job if they know less than someone on an internet forum
