Game of Thrones is dark. Like ... super dark. It always has been. But normally when fans of the HBO hit are commenting on how dark it is, the conversation is about tone, or storytelling twists, or gut-wrenching, unfair character deaths. Rarely does the term "dark" apply to the series' visual palette in casual conversation, and rarer still does anyone comment that an episode was actually too dark to see anything. But that latter criticism is exactly what happened with the series' record-breaking episode, "The Long Night", and cinematographer Fabian Wagner is here to respond. Wagner, the cinematographer for …