Issues
Canon had compatibility problems with the Lexar Professional 80x-speed Compact Flash cards which resulted in either total image loss, or the camera freezing up. In the cases of the camera freezing, the images may still be retrieved using an external CF card reader.
The camera will interpret the presence of a hot shoe protector as the presence of an auxiliary flash attachment thereby disabling the built-in pop-up flash. Removing the hot shoe protector will re-enable the built-in flash. A micro-switch in the hot-shoe senses the presence of the flash.
When using third party lenses, most notably older Sigma lenses, there may be a compatibility issue. Reports exist of people receiving "Err99" errors when using such lenses. The problem is more pronounced when using older lens that do not feature an HSM focus drive. Using the problematic lens wide open is sometimes possible. Another cause of Err99 messages involve EF-S 18–55 lenses (kit lens for the 350D and 20D) that are defective; purchasing used EF-S 18–55 lenses is a risk factor, especially from eBay auctions (some auction listings state if the lens was never used – especially those claiming that the lens was originally part of an EOS 400D kit; the best way is to verify the serial numbers indicating the manufacture date).
Read more about this topic: Canon EOS 350D
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