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If you're saying Sigma makes Canon or Nikon lenses you are wrong Ken. They do not come out of the same factory, not even the cheap lenses. AFAIK, Canon has never outsourced its lenses, not even the cheap ones. Up until very recently, all Canon lenses were made in Japan. Now the cheap ones are made outside of Japan, but the L series units are still made in Japan.
Sigma makes some very good lenses - I use a Sigma 150mm f2.8 EX APO Macro lens and it takes wonderful images, every bit as good as the Canon 180mm f3.5 L imho. AF is generally within 95% of Canon's AF performance too. The advent of HSM means that they also compete with Canon & Nikon on USM grounds (silent ultrasonic wave drives).
AFAIK, Canon is the only lens manufacturer to make lenses with flourite elements. Others tried, and gave up on the process. Canon's long L series lenses are very very good, and Sigma comes close, but does not entirely match them peformance wise (the same with Tokina and Tamron). Still, Sigma (and others) lenses are cheaper than what Canon/Nikon offer.
Dave
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