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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 for choosing Fixya!
lens af unit gear is broken, or lens af saft if broken, or lens af flex is broken.
or could be camera sub mirror spring is come out from mirror unit.
take it to canon repaire centre to estimate
'Error 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. As a first step, you can 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 shooting. If
the AF does not work still, you need to take the lens to an
authorized service center.
Most entry level SLR cameras will struggle to focus in low light, especially with the kit lens. By rights the flash should popup and emit a flash pulse to help focus. This is called focus assist. You might have to consult the manual to check if this function is turned on or not.
This is normal for an XSi. What might be causing this:
-Picture setting producing huge picture files (RAW vs JPEG)
-SD card not of same class, try using a faster card, such as a Class 6 or 10
Simga makes lenses to fit several different makes of camera bodies including Canon and Nikon. I'm assuming your Sigma lens has a Nikon mount, if so there are some adapters, but they may not work like you want - not all functions may work properly thru the adapter. For best results you should return or sell the lens and get one with the Canon mount.
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