Error 99 I have a Canon 10D that worked fine for a little over a year, than I started getting Error 99's. You click the shutter button and nothing happens except an odd sounding click, and the "error 99" blinking in the LCD. At this point the camara is usless until you turn it off and than back on. This became more and more frequent until now I just can't depend on my camara any more. The problem, with my camara seems to have nothing to do with lens contacts or the memory card. I have search several message boards, and it seems that this this Error 99 thing is not that uncommon with Canon DSLR's. I am wondering if there is a similar problem with Nikon, or any of the other DSLR's. I am trying to decide whether to pay to get this thing fixed, or just buy another camara or both. I have heard that getting an error 99 problem fixed can be quite expensive. If I opt to buy a new camera should I switch brands? Any openions on this? Thanks:

1. Turn off the camera.
2. Remove the lens, battery, and CF card.
3. Allow the camera to sit without power for approximately 20 minutes.
4. Insert a fully charged battery, and turn on the camera.
5. Depress the shutter button as you would to take a picture.
Does the “ERR 99′ message appear? If it does, then the camera should be
serviced. If it does not, then please proceed to the next set of steps:
1. Turn off the camera.
2. Insert the CF card.
3. Turn on the camera.
4. Format the CF card in the camera.
5. Depress the shutter button as you would to take a picture.
Does the “ERR 99′ message appear? If so, then the CF card is the most
likely source of the issue. Try using a different card.
If the message does not appear, please complete the following steps:
1. Turn off the camera.
2. Clean the lens contacts by gently rubbing them with a pencil eraser
or soft cloth. Be careful that you do not let any debris fall into the
camera body.
3. Reattach your lens.
4. Turn on the camera.
5. Depress the shutter button as you would to take a picture.
If the “ERR 99′ message only appears when one particular lens is
attached, then that lens should be examined by a service technician.
If you see the “ERR 99′ with a different Canon lens attached, then the
camera should be serviced.

It's probably the battery/battery contacts. It was relatively common with the 10D. I now use a 20D and a Rebel XT. I've had an Error99 once on my 20D, when I first got it, but none since them. I've never had an Error99 on my Rebel XT. By the way, upgrading from the 10D to the 20D would be well worth doing. The 20D simply has better electronics all around than the 10D. Even the Rebel XT does. I replaced my 10D with the Rebel XT. The XT really is that much better.

I get error 99 sometimes on my 20 D but it?s usually to do with a lens that is attached. Sigma lens have been known to cause error's. If it's not that or dirty contact on the lens then it could be a more serious problem. I would at least check it out with a canon dealer/repair centre.