At ƒ4, it's difficult to capture a lot of light, while keeping a reasonable ISO, and avoiding to exceed 30 seconds of exposure time so the movement of the Earth (relative movement of stars) does not create trails. Anyway, the result of the post-adjustment shows that finally, you can capture quite a lot of information! What an amazing view this Queensland sky (what our eyes are seeing is much closer to the processed result than the non one)!