While I'm on looking for ultra wide angle prime lens options, I discovered weakest lines of my beloved system. We don't have any prime lenses shorter than 12mm, excluding manual lenses from 3rd party manufacturers. I'm not interested those manual lenses, since AF is too good to be given up. It's so fast, accurate, and not bothersome, especially when it comes to perfectly implemented touch focusing&shutter release of m4/3 cameras. Combined performances and features, AF is a competitive advantage of this system. I digressed. Anyway I found some fish eye lenses instead of absenting rectilinear ultra wide angle lenses. But they are, yes, fish eye lenses. Unlike general lenses, they have curvilinear perspective, not rectilinear perspective. I know I can straighten them on computer after shooting, but I can't see straightened lines WHILE I'm shooting. I think I can't imagine straightened pictures seeing curved pictures on camera, and this would weaken composition of my works. That's the thing I can't handle. So here comes my suggestion: de-fisheye conversion on fly. Every digital cameras are something small computer specialised to image capture.(especially it's the case for mirrorless cameras) Because straightening curvilinear perspective is done by computer, we could do this on computer before capturing. Then we'll see rectilinear perspective with fish eye lens while shooting on flied, not sitting in front of computer. Shouldn't this be possible already? So far we're used to shooting with DSLRs, And they inherently don't allow this features. There's no way enable de-fisheye conversion for optical view finders. But mirrorless surely can. If manufactures provide perspective distortion datas for each lenses in their firmware, then they can be corrected on live view. Shooters could have choice for de-fisheyeing or not. If Olympus and Panasonic provide this feature by firmware of introduce with new cameras, we'll have two ultra wide angle lenses instantly. And perhaps it would be easier to introduce new fish eye lenses on the market, since they are no more mere speciality lenses appeals to minority. In short, I want this feature enabled if this is really any possible. Maybe I can misunderstanding something. But I believe this can be an one more advantage of mirrorless cameras. Mirrorless concept is a truly digital approach, not like DSLRs. With advances of computer vision technologies, we can exploit its inherit strength better.