Review on YONGNUO YN2 0X III Teleconverter Extender by Michael Heidelberg

I was keen to try this product to compare with the Canon 2X TV Adapter. It looks the same in the photos so I thought why not? The package it came in looked good and was well packed. Build quality and weight were good, and it fit perfectly in the body of my T7i and in the EF-RF adapter for my Canon EOS R. But no EF-mount lens I've tried has fit the other way. I've tried Canon and Sigma lenses. As if the holes for the bayonet blades were too small. And I confirmed that there was a large enough hole for the element to protrude from the end of the adapter. I ordered a replacement hoping it was defective. I don't have much hope. I'll update the review if the next one I get works better.