First of all, I'm very aware of the focal reducers with MFT mount. But as far as I understand, all of those are just full frame to APS-C focal reducers with MFT mount. So unlike an APS-C sized sensor, MFT with a focal reducer still only utilizes about 3/4 of the image created by a full frame lens. The thing is that I'm really fond of old full frame lenses and I feel like I can't use them to their fullest with any MFT camera and focal reducer combination. I don't care much about corner sharpness whereas I'd like to achieve the shallowest DoF possible. Under these conditions it seems inevitable to give up MFT for an APS-C mirrorless camera. What I'm asking is whether or not it would techincally be possible to create a 0.5x focal reducer in addition to the 0.71x ones that are currently available? And how likely is it that someone will ever produce and sell this?