Viltrox EF-EOS M Autofocus Lens Mount Adapter

Great value as purchased during sale. Does what it's says, though with the Canon RF 100-500mm it has limited range from 300mm -500mm. However the x1.4 produced stunning detail.

Good Points: Works extremely well with my EOS 5d mk4 with 100-400 mm lens attached. Great for wildlife shooting. Improvement Points: Nothing so far.

I bought this for wildlife photography and I very pleased with the product so far.

Good Points: Easy to use Improvement Points: A little heavy

Good Points: Works well with RF 100-500 f7.1 Len’s but drops overall f stop to f10. Improvement Points: The convertor is overpriced and the 2x version massively overpriced.