I would only suggest you might clean the metal contacts on the inside rim of the lens....just be very careful what you use....a pencil eraser is good but make sure you clean away any shavings that might get into the camera...
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Hi It is well known that some lenses made by Canon for the EOS film camera range do not work well with digital SLRs. Canon lenses work fine but it may be worth checking if the Sigma has a known problem with EOS digtal bodies.
I can help you fix the BUSY Error or Error 99 of your Canon EOS 1000D.
Installation of this Canon EOS 1000D firmware version 1.06 update will solve these problems:
Some cameras may exhibit a phenomenon in which the LCD monitor does not display, the shutter does not release, and the BUSY indication remains lit in the viewfinder.
The message, "Err 99 Shooting is not
possible. Turn the power switch to<OFF> and <ON> again or
re-install the battery", appears on the camera's LCD monitor, and after
the above operation is carried out,the LCD monitor displays in a
language that is different from the actual language setting.
See the firmware instructions and download the firmware upgrade by following theseFixya Tips:
Follow this link to download a pdf version of the firmware installation instruction guide.
Follow this link to download the Windows Version of the Canon EOS Rebel XS / Canon EOS 1000D firmware version 1.06 update.
Follow this link to download the MAC version of the Canon EOS Rebel XS / Canon EOS 1000D firmware version 1.06 update.
Follow this link to download the Canon EOS Rebel XS / Canon EOS 1000D Instruction Manual.
The 35mm Rebel Ti and the Rebel 300D use the same lens mounting protocol. All Canon cameras designated 'EOS' use the autofocus EF lenses. If your Quantaray lens worked on the Rebel Ti, it will fit and should work on the Rebel 300D.
Have you tried to take picture by switching off the autofocus to manual focus in a prperly lit environment?
If it takes a picture, then it has something to do with your auto focus system of your camera. In such a case: try taking out the battery, the memory card etc and switch off the camera and keep it for like that for about 5 minutes. And then insert only the fully charged battery and try again.
If it still gives you a problem and keep trying to focus You will need to take it to the nearest Canon Service centre.