yeah...Metabones speed adapters....
Metabones Ultra 0.71x Adapter
A mere $649 to adapt Canon EF lenses to m4/3 cameras.
This adapter for Nikon G-series lenses is a mere $479.
Metabones Speed Booster XL 0.64x Adapter MB_SPNFG-M43-BM2 B&H
I think the majority of newbies will not pay $649, or even $449, to adapt old, non-native lenses to their tiny-sensored cameras. Who wants to drop $649 to adapt a $40 Canon 50/1.8 "iffy fifty" to a nice m4/3 body? Would it be cost-effective to graft a $50 Nikon 35-70mm f/3.3~4.5 zoom lens by buying a $449 adapter? Or is it smarter to buy a superb system-native lens from Olympus?
Please note that I wrote, "T
here's no autofocusing avaiable in most adapted lens scenarios." Not in all scenarios, but in 99% of scenarios...most people have a $15-$40 adapter that provides nothing advantageous, just the ability to use non-native lenses, with all the drawbacks that entails. Of course, if they have $679 plus shipping, or $449 plus shipping, they could get some decent Canon AF or Nikon AF glass, and have it autofocus on their "selected micro four-thirds cameras", to use
Adorama's words!
I think the majority of newbies will not pay $640, or even $449, to adapt old, non-native lenses to their tiny-sensored cameras. People who constantly sing the praises of using non-native,or legacy lenses, on mirrorless cameras are propagating a cannard when they try to spin it and make it sound as if there are NO drawbacks to using outdated lenses on new, AF cameras. EXPERTS can work around limitations, but seriously, modern, AF lenses SUCK when a human is trying to adjust them for focus...the throws are so hair-trigger on many new-era AF lenses that manually setting the correct focus point can be very challenging for people who are less than experts.
There's zero doubt in my mind that system-native, modern, autofocusing lenses are _the absolute best_ performers for the majority of use scenarios. Take a Canon EF lens and try to manually focus it indoors in low light at a gymnastics meet or basketball game performance of your high school daughter or son...you'd be lucky to get a 50% focus hit rate on shots if you're manually focusing it at 15 to 75 feet...at those ranges, most AF lenses focus so,so,soooo poorly by hand-and-eye that it's not even funny. They were built for a computer to drive and focus...not a human eye and brain.
People who want to emphasize "possibilities" as a way to entice beginners and intermediates into thinking that their mirrorless body can "leverage" the d-slr lenses Canon and Nikon have been making for 30 years are doing a huge disservice to people. Tell them the truth: if you want a lens that shoots and focuses perfectly,under tough conditions--then you want a SYSTEM-NATIVE Autofocusing lens, one designed and built for 100% compatibility and high-level functionality for your camera's mount. Not some 50,40,or 30- or even 10-year-old lens that's been grafted onto your camera. If you are happy with 40 or 50% rejected shots due to missed focus, then by all means...feel free to adapt legacy lenses,and enjoy them for what they are, and how they work...just don't be too surprised when you take the camera out and blow shot after shot after shot under marginal to tough conditions.
FOCUSING dead-on has never been more critical than it is today. Missing focus by even a foot at under 30 feet can blow a shot. Missing focus by three inches at 10 feet can easily blow a portrait. Experts can handle limitations in gear: beginners and intermediate level shooters benefit hugely from good equipment that functions at the current, high level of modern AF lenses on their _own_ system's body lineup. Olympus and Sony and Fuji have superb lenses....BUY them, use them, get top-tier performance from them.