Help Me Understand: Optically How is the Z400mm TC Better Than Just adding a TC to a 400mm?

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Wildkits
Wildkits Regular Member • Posts: 233
Help Me Understand: Optically How is the Z400mm TC Better Than Just adding a TC to a 400mm?

Or is it better?

I'm not talking about the convenience of having a TC at the flip of switch. Rather, what are the optical advantages to having the TC built into the lens body? How much does tailoring the TC optics to this specific lens improve optical and AF performance compared  to the IQ and AF performance of a general purpose TC designed to work with lenses from 70-200 all the way to 800mm?  And, of course, if better then why?

Reframing the question, how close and what is the difference optically between the 400mm with TC activated and an instrument designed to be a dedicated 560mm lens?

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