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The error 99 on your Canon is the last thing the camera can think of, if it really does not know what is wrong.
If you don't have the message when using a different lens, and the error keeps coming back with that lens, you are right it is in the lens. But again the camera can;t find out what.
The only thing you can do is make sure the contacts are clean and shiny and nothing os blocking free movement of all the parts on the lens. If you can't get it working correct, please contact a Certified Sigma service centre.
If the Sigma lens mount is a Canon FD fitting then you can get an adapter FD to EF that will allow you to use the old lens in manual mode. If your camera isn't designed to take EF-s lenses then they will not fit on the camera. My EF-s lenses will not fit on my 6D.
Have you tried cleaning the contacts? Taking out BOTH batteries? (There's a button cell as well as the main battery.) If you have a second lens you can test, i'd give that a shot first.
Either way, probably need to have it replaced or repaired right away.
Finally, have you got the latest firmware version? The XS is currently
at version 1.0.5, which was released in April of this year. You can
download it here.
From working with third party lenses in the past what I've found is that Canon doesn't give up the "chip" technology so the older lens can not talk to the newer cameras. I suspect that Canon does this to promote their lenses over the competition. You might be able to send the lens to Sigma and have them re-chip it and have a great lens again.
99' indicates some problem with the AF contacts. This is a common error
in Canon lenses. It could indicate a very simple problem like dirty
contacts or a much serious one like the breakage of USM cable. Alternately, it can also be a card error or camera error.
remove the lens, battery and card and leave the camera like that for
about 30 min. After that, insert a fully charged battery and switch on
the camera. If the error still shows up, it is a fault with the camera
and has to be serviced.
If not, turn the camera off and insert the card. Format the card in the
camera and depress the shutter button. If it shows an error, the card is
If not, try cleaning the lens and body contacts (the metal
contacts between the lens and body) using a pencil eraser. Be careful to
hold the body facing down so that no dust falls inside. After cleaning
both the lens and the body contacts, re-attach the lens and try
If the error still shows up, you need to take the lens to an
authorized service center.
error 99 may be the only error that the camera can identify with the problem. Generally this is dirty contacts in the camera and on the lens. The fix is to rub them with a pencil eraser and ensure no rubber swarf gets inside the camera. ( Hold upside down and use a blower and brush for cameras after doing it. Do the same to the lens contacts and re position turn on camera and see if it works ok now. Please rate my help++++Thanks for using FIXYA