Viltrox EF-EOS M2 Speed Booster

However I can only put the full frame lens the red dot lens on the Viltrox speed booster. You can see too that the Canon adapter is a bit thicker than...

This is the Canon mount that is not a booster and rocking it back and forth I don't really see much difference between the Canon and the Viltrox so th...

The first thing I wish Filtrox can do a little bit better on this speed booster is quality control. The speed booster feels pretty cheap. Not price bu...

That's why I'm keeping mine. That's it, those are my thoughts on the Filtrox 2.71 Micro Four Third to EF Speedbooster

I have the Viltrox EF-M2 speed booster and rarely use it. IMO, using adapted lenses to get the extremes of the focal ranges doesn't really make sense. Firstly at the wide end there's the crop factor to contend with, even with a speed booster, so it's much easier to get wide using native glass. At the telephoto end, you're essentially carrying extra glass for a larger image circle than you need, and there are already lots of cheap telephoto lenses for the system with a small image circle (and thus smaller size).