Hi Robin,
I should give Sigma a ring, they are extremely helpful.
I had a similar problem and ended up with returning that particular Sigma lens (17-35mm), and my first Canon 10D, and with a new body and a secondhand Canon 17-35mm have not had the error again.
There was talk of some lenses needing re-chipping. Also, I believe some Compact Flash cards can be at fault.
Sorry that I can be of no more help.
Rod Rod Wynne-Powell
On 15 Jun 2004, at 14:17, Robin Scagell wrote:
Yesterday a friend brought round his Canon EOS 300D and new Sigma zoom lens. I tried the lens on my 10D out in the garden in the bright sunlight but though it apparently took the picture it wouldn't save it and gave an 'Error 99' message. He then tried it on his 300D and got the same problem. It happened even if I tried shooting at a manual setting, so I deduced that it was caused in some way by the contacts on the lens. Error 99 in the Canon manual is at the bottom of the list and is described as 'Some problem other than the above' which is very helpful.
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