Auto Lens Reversing Adapter Canon EOS-R (EOSR-RETRO) | Novoflex
Camera Macro Lens Reverse Adapter Set for Canon EOS 70D 80D 700D 750D 800D 1200D 100D 200D 5D2 5DIII 5DIV 6D Mark II 77D 7D DSLR - AliExpress
Reverse Adapter Canon EF-Mount
Amazon.com : 55mm Macro Lens Reverse Adapter Ring for Nikon D3500 D3400 D5600 Camera with AF-P 18-55mm Kit Lens and More Nikon F Mount DSLR Camera with Lens Has 55mm Filter Thread :
Macro Reverse Ring for Canon - Camera Mount to Filter Thread Adapter f – Fotodiox, Inc. USA