Sigma TC-1401 Teleconverter vs Canon Extender Sigma 150-600mm Contemporary

Sigma TC-1401 Teleconverter vs Canon Extender Sigma 150-600mm Contemporary In this video I am comparing the Sigma teleconverter TC 1401 with the Extender III extender I am trying to test the Sigma 150-600mm Contemporary lens with both a canon and sigma extender