Super broad zoom range for 1.3x EOS 1D
Closest you will find I think is the Canon 28-300L f/3.5-5.6. It is the push-pull zoom like the 100-400. Best quality in a superzoom you can buy for Canon.
Here is a link to the Digital Picture Review: http://www.the-digital-picture.com/Reviews/Canon-EF-28-300mm-f-3.5-5.6-L-IS-USM-Lens-Review.aspx
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