Canon 100-400mm II only reaches to 370mm?

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Bill_Edmunds Forum Member • Posts: 63
Canon 100-400mm II only reaches to 370mm?

The photographer in this video claims that the Canon 100-400mm II lens does not reach to a bona fide 400mm, whereas the 400mm f.5.6 prime does. Have you found the same thing?

Bonus question: Does the 400mm f5.6 prime maintain AF with the 1.4 III TC? I've seen claims that it does (center point only) and that it doesn't (at any f-stop).

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