How can I fix Error 99 on my Canon EOS Digital Rebel?

"The err99 could come from a lens incompatibility, a battery problem, a shutter problem or just ""dirty"" contacts on the body/lens contacts

does the problem always occur ?

i reccomend reading this"

"Well if it's a sigma lens, it might be one that is incompatible with newer canon bodies (DSLRs) if this is the case and you're handy, you might want to try this hack:

http://www.martinmelchior.be/2013/04/con...

It involves adding an additional microcontroller inside your lens. Tricky but not Impossible (I just did it myself).

Cheers,

Jack"

"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.

http://www.fixya.com/support/t182551-err..."

"Apparently this error code is common with digital SLR cameras as, I found out with my eos 350d.

Turn off the camera, remove lens, remove battery, remove cf.

wait about 30 minutes.

Insert battery and turn on but, leave the lens of & the cf card out

Take a picture. If you get err 99 your camera is broken and you will need to send it in for service.

Insert cf card if that gives you err 99 when you take a picture then its the cf and replace it.

Replace lens and take a picture.

If err 99 then its the lens or the contacts.

Clean your lens contacts on both the camera and the lens. Canon Tecks suggest to try this cleaning method, hold the body with the mount facing the ground & gently rub the connections with a pencil eraser then, do the same with the lens.

Retry. If you still get err 99 and it is a valuable lens, send it in for service.

If its a cheap lens, or if your desperate enough with a valuable lens try gently tapping it and shaking it. Repeatedly zoom in and out and focus while in manual focus setting. If no results try manually changing focus ring in autofocus mode.

If not get a new lens"

"An Error99 could be anything, absolutely anything could have gone wrong with it.

Does it always show Error 99? or does it only show Error 99 every now and then? Is it when you do something specific?

Try switching your CF card, battery, and lens and see if that helps

Any EF or EF-S lens should do and any CF card should work

Batteries on the other hand should be genuine Canon battery or a reputable generic brand.

If this does not work, contact Canon and they will tell you the closest repair facility you can send it to to have it checked out."

"An error 99 is not anything, but is an undefined error that's not described by one of the documented error codes. That's been standard for decades. I always start with the quick-and-easy stuff. A soft pencil eraser to clean contacts on lens and body, and the battery. Visual check of memory card and compressed air to clean contacts of dirt.

Similarly, my flash gave an error, and compressed air cleaned the sensor arm in the tiny hole below it, and all was well. Use low pressure and be careful. Use extra light for a good visual inspection."