RichRMA: Having seen these things in the astronomy world for 30 years, many of us were wondering when they'd release something like it for cameras. Now that it's here, we see the expected shortcomings (added aberrations) and realize it will be mostly a "centre of field" device. But I'm wondering if it even makes sense getting one? You can buy f/1.4 lenses now from 24mm all the way to 85mm and that is pretty fast. Some of them are very sharp, even wide open. There are also lenses that are as fast as f/0.95 (Schneider CCTV lenses, and others, usable on m4/3rds). My guess is most people will find that going up one stop in ISO will be a better idea than using this compressor except in rare circumstances were every last drop of speed is needed. This kind of device would have been far more useful 5 years ago when cameras were much noisier at high ISO.
There are 17 and 25mm f/0.95 primes available for the u4/3s system.