Originally Posted by
CPRich
I think the Bigma is in the $1K range - those are the only affordable sub-megabuck 400mm+ (Sigma 50-500, Canon 400 and 100-400).
The 1200/5.6L was about $80K and rumor is there are about a dozen in the world - SI owns two. It was discontinued in 2005. A Wemberly gimbal-type tripod is practically required for a 1200, 600, Sigzilla.
I would go with the shorter L lens from Canon at a grand.