Good night! I'm from Brazil and bought my canon in Orlando in March this year. Today when I connect it appeared the message "lens error / automatically deletes / restart camera", and hangs up. What do I do??

Almost all early Quantaray lenses (and Sigma lenses, Sigma made Quantaray) in the Canon EOS mount will show error messages on Canon digital cameras (but still work fine on older EOS film cameras). usually err99 but err01 also. There is no DIY fix and Sigma ran out of update parts years ago. Current production lenses and Canon made lenses will not have this problem. This lens would only work for someone shooting EOS film cameras with no intention of "upgrading" their system to digital Canon cameras in the future.

CANON ERROR 99 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.youtube.com/watch?v=WkXyLieNUDI - - - - - VIDEO & VOICE INSTRUSTION. Error 99

Unfortunately, many cameras that fall prey to lens error problems can only be corrected by professional repair. But, here are some last resort troubleshooting steps that you can try that may correct it. They only seem to work for less than 40% of the lens errors, but if the camera is out of warranty (or repair cost approaches that of the camera), they're worth that try.

I'm afraid that it's a new lens assembly or a professional repair. Unless the camera is still under warranty.
Same thing happened to my Panasonic Lumix. I completely stripped down the camera to see if I could find the offending bit of dust or dirt that everyone online says is the problem. No chance. I tried all the tricks, including banging the camera quite hard on my kitchen table (I was quite frustrated by that point!)
I've narrowed it down to a small motor that controls the lens and consequently the focus part. But you simply can't buy the parts. A professional repair quoted more than the camera was worth so I sold it on ebay for 'spares or repair' and bought a new one.
The 'lens error' problem plagues all of these compact zoom cameras, so unfortunately it's a very common fault and expensive to repair.
Sorry it's not good news.

Welcome to FixYa.

Getting message of "Lens error" occur if you hold the lens while it is in motion or when using it in a location with excessive dust or sand in the air.

If this error continues to appear, contact a Canon Customer Support Help Desk as there may be a problem with the lens.

I hope this information will help your issue on your camera,

Thank you for using FixYa.

Welcome to Fixya
Err 99 could mean several different things, such as... Memory Card, Lens or Lens contacts....

Here's what you can try:
Remove the memory card an enable "shooting with out memory card" and see if you still get the error. If it works your memory card is bad. Try another lens if you can. Clean the lens contacts with a pencil eraser (be careful not to get eraser dust in the camera body or in the lens). Worst case scenario is, Err 99 could be related to the shutter failing which would mean a trip to Canon.
Thank you

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Consider NOT connecting your camera to your computer.

The best way to download pictures from your camera to your computer involves removing the memory card from the camera and plugging it into a card reader (either built-in to the computer or connected via USB or FireWire). This is likely to be faster than connecting the camera to the computer, and won't run down your camera's batteries.

Once the card is plugged in, it will appear to your computer as a removable drive. You can use the operating system's drag&drop facility to copy pictures from the card to the computer's hard drive, the same way you copy any other files. Or you can use any photo cataloging program.

Definitely worth fixing, the G9 is an amazing camera and many will argue it is better than most of the other models that came out after. Since you have a Powershot, you can have it repaired through www.camerasandparts.com They just deal with the Canons and they are not expensive at all. It runs $89 for everything if you just get their lens error service package. They cover parts, labor, servicing of the whole camera, with shipping back included for $89. The best part, they do outstanding work on the Powershots. If you're going to have it serviced, I would go through them. Ultimately you'd need to decide if it's worth the $89 to have a good backup camera, if not I'll take it off your hands. In all honesty, the G9's are great cameras, don't think twice. Have it serviced and enjoy the camera again. That would be my advice.

I have faced similar problems previously with my Canon 20d and Sigma 170-500. Its even more annoying to see it happen in field while it would be okay back home. I was told that it is electronic compatibility problem instead of complaining the best was to change the lens and hence bought a 100-400 and happy ending.

Had my S2 IS now for 3 years , never had a problem with the lens. I'm careful not to bump my lens into anything. I actually bought the lens hood and put a filter on my lens so that no dirt can get into my lens or I can't accidentally bump my lens into anything while i'm using it as it's protected by the adapter and filter.