Mirrorless lenses allow you to experience the fun of supertelephoto focal lengths without the often stratospheric prices, but they generally come with a few compromises as well. Nonetheless, depending on your needs and budget, they can be a decent alternative. One such option is the Tokina SZ SUPER TELE 500mm f/8 Reflex, and this excellent video review takes a look at the lens and the sort of performance and image quality you can expect from it in practice.