I got a chance to check out the two brand new Teleconverters from Sony for the FE70-200mm f/2.8 GMaster lens. The 1.4X is tiny. It's the smallest 1.4X I've ever seen and you hardly notice it when it's attached to the A7RII. Best of all, I cannot see any performance loss in either initial AF acquire or in tracking speed and accuracy vs. the lens attached directly to the camera without it. The 2X is also excellent and is still smaller in size than even the Canon 1.4XIII, and also enjoys great speed tracking but it's acquire is just a step behind the 1.4X. Both are killer new additions to Sony Alpha.
Sony FE1.4X TC (SEL14TC)
Sony FE 2X TC (SEL20TC)
