Even a slight shake will ruin a long-exposure shot.
You want a lens with a low f-stop (f/2.8 or lower) to let in as much light as possible. aurora north aubrey kate hot
Interestingly, the region near Kate is known for its geothermal pockets. There is nothing quite like soaking in a hot spring while watching the freezing sky catch fire with solar particles. Even a slight shake will ruin a long-exposure shot