new optics design Focal reducer/Speed booster adapter for / Canon EF lenses to m4/3 (mft) mount cameras
All metal structure, with excellent opticals (4 elements/2 groups)
Note: Canon EF-S lenses do not fit ! (it 's for the full-frame EF lenses only)
what it does:
- reduce the focal length (by 0.72x wider)
- effectively increases the maximum aperture of the lens by 1 stop (in other words, under the same aperture, you can use faster shutter speed (by 1 stop).
what it does not:
- there is no electronic integration, no auto fucusing