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ERR-99 on 20D

bailey73 Plus
14 357
4 Jun 2005 3:55AM

I was playing around with my new toy yesterday and err99 flashed up on my Lcd, I turned the camera off and then back on and as soon as I started to focus it flashed up again.

At the time I was using the 20D with the 100-400IS lens, the battery was fully charged but I replaced it with another battery and it didnt come up with an err message, tried the original battery again and again no err message.

According to the user manual err-99 may occur if you use a non Canon lens and the camera or lens does not operate properly.

Has anyone else had this problem or know of any other reason why the message may have come up.


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trivets12 Plus
13 1.3k
4 Jun 2005 3:57AM
Has this happened with other lenses, or just the 100-400?
4 Jun 2005 4:03AM
This happened to me with a Sigma 28-300mm. It was a software problem with the lens (about 6yrs old I think) due to its age and not being compatible.The err99 only occured intermittently and usually when in Av mode.

I sent the lens to Sigma for a service and upgrade - no problems since. Also the lens was returned in a week - excellent service
bailey73 Plus
14 357
4 Jun 2005 4:10AM
The problem has only occurred with the Canon 100-400Is, I have a Sigma 28-135mm and it hasnt happened with that one (yet).

Thankyou for your quick replies.
4 Jun 2005 4:22AM
I had this problem when I was using a Tamron 28-80 as a stop-gap while the lens I wanted was on order. There didn't seem any pattern as it seemed to occur randomly at various apertures and in various modes. I found quite a lot on the internet about it but no definitive answers, but came to the conclusion it happened only with non-Canon lenses which were not designed specifically for digital cameras. Therefore surprised you should get it with a Canon lens, and an expensive one at that. Might be worth seeing if Canon can do anything (if anyone can...). If not, a Canon lens not working on a Canon camera looks like grounds for demanding a refund.
laura16 Plus
14 606
4 Jun 2005 4:43AM
Doesn't the err-99 just mean something is wrong but they don't have a specific code for it? i thought I read that on another thread a while back. Mine did it the first night I used it, gave me a real turn ha ha. I was actually reviewing the photos at the time and until I took the battery out and put it back in I couldn't get rid of it.

Hasn't done it since...touch wood.
4 Jun 2005 4:48AM
I reckon it means you've got a Cadbury's Flake stuck in the camera.
laura16 Plus
14 606
4 Jun 2005 4:54AM
4 Jun 2005 5:30AM
yeah but only the crumbliest flakiest sort

it has happened to me a few times now
make sure the contacts are squeaky clean
and dont wipe them with your finger
wotashot Plus
14 2.2k
4 Jun 2005 6:01AM
Do you get bits and juice with that?

It happened to me within the first couple of days of using my 20D (With 18-55), the message flashed up, I turned off the camera, turned it back on and have never experienced it since (touch wood)

4 Jun 2005 8:45PM
It might also be worth checking that you have the latest firmware release (v2.0) which can be downloaded from Canon's website.

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