Mx330 From Mexico, joined Oct 2002, 838 posts, RR: 12
Reply 4, posted (11 years 4 days 13 hours ago) and read 1797 times:
Well I guess I'm not the only one.
I do get a lot that err and it is on some special light conditions.
What I do to kind of repairing it is or to take a couple of manually focused shots or to change the ISO, also changing the lens and putting it back works.
I really hate that error and it always happens when the plane that I'm waiting for comes in.
I have a Canon lens but it is kind of old now... I'll be getting my new one shortly and hope that it really helps.
Anyways if somebody can help us out with it it would be great.
All Canon! EOS 5D mk III, 8mm, 17-40, 24-105, 70-200 f2.8, 100-400L
Dehowie From Australia, joined Feb 2004, 1083 posts, RR: 32
Reply 5, posted (11 years 4 days 9 hours ago) and read 1771 times:
Are you using the vertical grip.
I was having error 99's on my 10D and it was simply a dirty contact on my vertical grip.
Problem solved after 3 months of investigation.
Also if not clean your battery contacts as well.
Take it easy
Haskey From United Kingdom, joined Sep 2001, 100 posts, RR: 0
Reply 8, posted (11 years 4 days ago) and read 1722 times:
I had the Error 99 problem on my 300D when I first bought it and borrowed an old 75-300 Canon lens from a friend just to try. Sometimes it worked, sometimes it didn't. I believe it was that the brass contacts on the lens were quite worn/dirty and sometimes just by removing the lens and cleaning the contacts fixed it. But certainly not 100% reliable.
I have heard from various people that it can also occur when using a non Canon lens ie Sigma etc which may have to be re-chipped to make it compatible.
In the end I went and bought a brand new Canon 75-300IS and no problems at all since.