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New type of teleconverter coming from Canon alongside a Supertelephoto zoom

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Curious, how old are the current TC 1.4 and 2.0 converters? I see folks trying them and not really impressed with results on the new RF 100-300. I just feel the WOW factor has yet to be seen until the new TC is released. I would hope the glass and technology in the new TC will really be different for the new big whites. Am I wrong to think this way?
 
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Curious, how old are the current TC 1.4 and 2.0 converters? I see folks trying them and not really impressed with results on the new RF 100-300. I just feel the WOW factor has yet to be seen until the new TC is released. I would hope the glass and technology in the new TC will really be different for the new big whites. Am I wrong to think this way?
All of 3 years old - newly designed for RF lenses. Apart from restricting the focal range, they are good with the RF 100-500mm. The two biggest whites, the RF 800 and 1200, are the 400 and 600 with built-in 2xTCs that are custom designed for those lenses and better than the removable ones for those.
 
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Ah, cool, so hoping the new TC is custom designed for the new big white zooms, thanks!!!
What @AlanF is saying is that those custom-designed TCs are included in the optical design and in the barrel of the 800/5.6 and 1200/8 lenses. That was not done with the 100-300/2.8, and according to the most recent rumor will not be done with the 200-500/4.

Given that the RF TCs are pretty new, there's no reason to think there will be MkII versions of them. Thus the speculation of some sort of 'new' TC, e.g. a switchable 1.4x/2x. However, such a TC would be an add-on, and as such Canon would design it to work with any TC-compatible lens. Very unlikely it will be specifically optimized for the 100-300 or 200-500, IMO.
 
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