Are these new extenders compatible with the
Canon EF 28-300mm f/3.5-5.6 L IS USM
As a 28-300 and EF2x II user, the picture of the 2x Extender indicates that they will not be usable together. The reason is mechanical, the 28-300 lens system moves back toward the body a fair way during zooming, the extender appears to project forwards from the body by enough to be a problem.
I can only use my 2x Extender with my 100-400 Canon, and then it only works with manual focus because the aperture effectively becomes too small for auto-focus..
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