If you’re a wide angle fan the Sony FE 12-24mm f/4 G is a great option and it’s almost half the weight of the competing Canon/Nikon lenses. Kai seems to really enjoy the 12-24mm, but he is having trouble with his Sony a9 over heating, which is unfortunate. The low distortion of the 12-24mm makes it a very useful lens and it will likely be the next Sony lens I decided to purchase myself. I love high-quality ultra wide zooms, especially when they are light weight.