I've been having a lot of fun with my new SpeedBooster and Tokina 11-20/2.8. Yes, the autofocus is a bit clunky (I blame Tokina at least partially for that) and the combination is not small. But I just about lost any interest I ever had in the Olympus 7-14/2.8 or Panasonic 7-14/4. The SpeedBooster (and Tokina) really is that good. All this got me thinking that a good focal reducer essentially gets one the best of both worlds. When size and weight are important, I can use native lenses. When low-light and shallow DoF are needed, I can use adapted ones and get exactly the same AoV and DoF available to APS-C and full-frame Canon (or without AF, Nikon) cameras. Well, almost. The problem is that at 0.7x, the current focal reducer options only undo the crop from full-frame to APS-C (yes, there are special wider focal reducers for the BlackMagic cameras, but those aren't really that helpful when shooting still photography, and the native m4/3 lenses aren't so useful there). So to undo the crop from full-frame to m4/3, the focal reducer would need to be 0.5x. Of course, that's not a problem if you have, say a Sony A6000. There, that 0.7x focal reducer really does undo the sensor's crop factor with respect to full-frame. Alas, the Sony APS-C mirrorless lenses don't really offer anything approaching the high quality compact zooms and primes of m4/3. So here's the question - which do you consider more likely to happen - Sony fixes their lens lineup for APS-C mirrorless (and adds IBIS), or Metabones (or some other third party) puts together a good 0.5x focal reducer for m4/3?