Review on Meike Auto-Focus Metal Lens Adapter EF-EOSR Converter for Canon 📷 EF/EF-S Lens to EOS-R, EOS-RP, R5, R6, and RED Komodo Cameras by Jon Joung

The adapter seemed to work fine with all my EF lenses on my R6 body, even the 3rd party (Sigma) ones. However, the adapter did not snap onto the camera mount. I was afraid that a slight shake could accidentally separate my camera from the attached lens and cause serious damage. I thought about the fastening mechanism and realized that this is not rocket science. Using vernier calipers, I measured the camera mount's locking pin and the corresponding mounting hole on the adapter. The pin size was approximately 0.083 inches. The hole size of the adapter is about 0.095 inch. So the hole was really big enough. But the pen didn't fit. I took a standard 3/32" twist drill bit and inserted it into my drill press and then blocked the bit's downward movement so that it was all the way down the hole in the adapter. I then turned on the drill press and carefully pushed the adapter a few thousand inches (toward the contact side of the adapter) against the drill bit. You have to somehow visualize the adapter being installed and understand that it can't go "far enough" to snap into place to figure out which side to scrape off. It only lasted a few seconds. After blowing off all the chips and giving the adapter a good cleaning, I tried reinstalling it and voila - it fits perfectly. Nice and tight. Not sure if this will help anyone - AND I AM NOT RESPONSIBLE if you mess up your adapter. Try this at your own risk. But it worked very well for me.