Fujifilm XF 23mm F/2 R WR Lens - Silver

Equal to 35mm ish in Full Frame terms, if I had to pick just one lens to use for the rest of time, this would be the mm length. Small enough to not be intrusive and ultra fast at f/2 for your low light situations and a lovely bohek. Watch Christopher Frosts' video review (from non mobile devices like a desktop or laptop) for his honest and unbiased opinion.