Good day,

Is it possible to link two teleconverters via an extender?

I have a Canon x1.4 and a Tamron x1.4 with the appropriate lenses for each. The converters don’t offer the possibility of joining them.
My mind is suggesting that it may be possible to hook up an assembly of
400 lens - x1.4 - extender- x1.4 - Canon EOS 90D. It would be manual focus only of course but would offer a possible 1250mm focal length including the crop factor of 1.6.

Thank you, kind regards,
Dennis