How is this different from other manufacturers? Focal distances are pretty similar between all of these for SLR versus mirrorless. Canon offers adapters for th

How is this different from other manufacturers? Focal distances are pretty similar between all of these for SLR versus mirrorless. Canon offers adapters for their mirrorless cameras, both EF-M and RF. https://www.canon.ca/en/products/Lenses/Mount-Adapters https://www.canon.ca/en/products/Lenses/Mount-Adapters Nikon has the f to z adapter: https://en.nikon.ca/nikon-products/product/lens-mount-adapter/mount-adapter-ftz.html https://en.nikon.ca/nikon-products/product/lens-mount-adapte... Sony has an A to E adapter https://electronics.sony.com/imaging/imaging-accessories/imaging-lens-accessories/p/laea5 https://electronics.sony.com/imaging/imaging-accessories/ima...