So you've got some old Exakta mount lenses lying around and you're shooting with a modern Micro Four Thirds camera (like a Panasonic Lumix or Olympus OM-D)?
This adapter is what bridges the gap.
It's a simple metal ring—mounts the Exakta lens to your M43 body.
No glass, so it won't mess with image quality.
Just manual focus and aperture, but that's half the fun.
Made in China, generic brand, but it does the job.