A few pointsZeiss and Voigtlander don't even require any new protocols! No AF. That means they could essentially build in an adapter and use EF protocols they already have.
Samyang/Rokinon HAVE made RF glass, even some that does AF. How did they do it? Using EF protocols? China has a reputation for ignoring patents and intellectual property, so it could also be that they got a copy of the RF protocols and used it without license.
I suppose everyone is different, but what you mention is fully a non-issue for me. Once the lens is on, you don't even notice the adapter is there. If you are changing between EF lenses, you just push a different button for the lens release. Its almost fully transparent. The weight is negligible, and while you can measure than an RF equivalent would be an inch or two shorter and a couple of ounces lighter, in practice what you are using is not any larger or heavier than it was on a DSLR. I sometimes feel that people who say things like this about the adapter just haven't really tried it. Of course I'm sure there are people who shoot differently than I do, and maybe they are changing multiple lenses very often.
Brian
The Zeiss Batis lenses all have AF.
Yes Voigtlander don't need AF protocols and yet they still haven't supported the RF or Z mount. They did however release a lens for X mount AFTER Fuji opened it up.
Samyang stopped making RF lenses very abruptly and never explained why, Rokinon don't sell lenses in Europe directly the only way to get them in this part of the world is to import but we wouldn't get a warranty which for many people here won't be an option.
There are many of us who simply only want native mount glass on our bodies, whether that's 3rd party or OEM. Then there's the fact that native mirrorless glass often is sharper, smaller, lighter, faster to focus, is designed to resolve more megapixels and designed to shoot at faster frame rates. Its perfectly fine if people want to adapt their DSLR lenses but for those don't their options are very limited at the moment.
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