Digital BW, The Print

>  The new Digital Rebel XT gives me "Error
> 99" with my Sigma 24mm.  That code means the camera is incompatible with
> many (all??) third party lenses.
> Paul

I don't use Sigma lenses but the latest lenses are compatable. How old is the 24mm that 
you have? Sigma, if lens is not too old will rechip it for free or a moderate fee.