Just arrived - the latest prototype of the world's widest rectilinar f/2 Micro Four Thirds lens - the Laowa 7.5mm f/2 mFT.
During Photokina 2016, Venus Optics presented first prototypes of two new ultra wide angle lenses - the Laowa 15mm f/2 for full frame and the Laowa 7.5mm f/2 for mFT. Although I left mFT some years ago in favor of full frame, I still appreciate mFT in situations where more compact and lightweight gear is required - e.g. when recording 4K footage on a drone. I found the Yi M1 quite interesting (see my review here) but had to recognize, that it uses only a crop of it's 20 MP sensor for 4K video which makes it quite hard to find lenses that provide a very wide angle even in 4K mode. Before the Laowa appeared, you could find in this focal range only fisheye lenses or the heavy and expensive Lumix Vario 7-14mm zoom. It is also worth mentioning that you can use standard filters with a filter thread of 46mm (an earlier prototype shown on the Photokina used 49mm but 46mm will be the final diameter) and the lens hood is removable.
This is, how this little 170g gem looks on the Yi M1 mirrorless:
But before putting it on a drone, I took it around for some photos in Hamburg's Hafencity and it's new town landmark, the "Elbphilharmonie", where it could demonstrate it's extreme viewing angle of about 110° combined with good low liight capabilities and even some potential to play with depth of field. In all following photos there was not any electronic correction for distortion, chromatic aberrations (CAs) or vignetting used. If you click on the photos, the flickr photo page will open so that you can see EXIFs and select higher resolutions including full size.