Review on Yongnuo YN50MM F1.8 II AF/MF 0.35M Focus Distance Standard Prime Lens for Canon EF Mount EOS Cameras 5D Mark IV, 1DX Mark I, 200D Mark II, 850D, 7D, and 6D Mark II - Black by Patrick Hamilton

The lens is great, it works and the photos are as clear as a normal SLR lens. Just a problem with the autofocus. It's not always centered on your focal point. Once out of 10 the autofocus doesn't work clearly. It's EF, not EF/S, which is why you use a red dot to attach the lens. I'm assuming that's why the autofocus isn't working. I've looked in the camera settings for an option to adjust the EF lens, but there is no option in the settings to toggle between EF and EF/S. This is a great lens for the money.