This is a manual lens adapter, it won't work with autofocus lenses. If you check the base of your EF/EFS lens you will see multiple gold electrical contacts but the K&F Concepts lens adapter does not have any of these. Hence it is unable to pass signals from the camera to the lens. The product description says, "As Canon’s EOS lenses are electronically controlled，most Canon EF mount lenses do not feature a manual aperture ring，so when used on our EOS-EOS R, which is a fully manual operation adapter ring, the aperture could not be transferred to the camera, it will stop down to its smallest f/stop by default." 

No. You cannot connect RF lenses anywhere but to R series Canon 

This is a manual lens adapter, it won't work with autofocus lenses. If you check the base of your EF/EFS lens you will see multiple gold electrical contacts but the K&F Concepts lens adapter does not have any of these. Hence it is unable to pass signals from the camera to the lens. The product description says, "As Canon's EOS lenses are electronically controlled，most Canon EF mount lenses do not feature a manual aperture ring，so when used on our EOS-EOS R, which is a fully manual operation adapter ring, the aperture could not be transferred to the camera, it will stop down to its smallest f/stop by default." 

Don’t forget that it’s a manual lens adapter. Works with full manual lenses. If your lens has no physical aperture ring, you cannot control it from your camera 

No Allen wrench comes with the unit and I did not need one. Mine did not require any adjustments and fit like a glove. 

Hi, this adapter is for Canon EOS mount lens to Sony E NEX mount camera, we checked the sony a 7iii camera mount is E mount , this adapter can fit it , but you can reconfirme it , thanks. 

Yes, it is indeed Nikon f mount. 

Hi, this adapter is for Canon EOS mount lens to Sony E NEX mount camera, we checked the sony a 7iii camera mount is E mount , this adapter can fit it , but you can reconfirme it , thanks.