So, why buy the 600mm DO f11 if you can shoot native with the 100-500 + crop AND it is unlikely the extenders will provide any benefit on the 600mm due to the f11 aperture?
Because the 600/11 and 800/11 are going to be a LOT cheaper than the 100-500, much less than a 600mm or 800mm f/5.6 lens.
If you are using the 100-400 II and 200-400/4 lenses, the 600/800 f/11 lenses are not meant for you.
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