This is the Laowa 7.5mm f2 Ultra Wide Rectilinear lens...sounds technical, well that's because this tiny beast is pure awesomeness!
7.5mm on a GH5 is 15mm full frame equivalent...and yes...theres no bendy lines, its dead straight and that's what makes this lens the best there is!
Check out our review video below, and if you enjoyed it, buy your Laowa 7.5mm lens here - https://geni.us/LaowaWide