Digital BW, The Print

Paul

That condition appears to be quite common with Sigma lenses. I believe some
other third party manufacturers (such as Tamron) license technology from
Canon to make their compatible lenses and it may not happen with those
lenses. I think Sigma must reverse engineer Canon cameras to design their
Canon lens interfaces.

For newer Sigma lenses (I don't have any and haven't done this personally) I
understand that they can be returned to Sigma for a firmware upgrade which
can make them compatible with newer cameras.

So, it's not really Canon's choice in the matter. I guess they could charge
less for the lens interface technology.

Tom

> -----Original Message-----
> From: DigitalBlackandWhiteThePrint@yahoogroups.com
> [mailto:DigitalBlackandWhiteThePrint@yahoogroups.com] On Behalf Of Paul
> Roark
> Sent: Tuesday, April 26, 2005 10:44 AM
> To: DigitalBlackandWhiteThePrint@yahoogroups.com

... deleted

> 
> Well, Canon has joined the club.  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
> www.PaulRoark.com


...trimmed