There are many proponents for using just one lens, often a 50mm prime. They argue that it improves your ability and liberates you from heavy bags and opportunities lost in switching lenses.
I started out with a Zenith and a 58mm Helios lens, and it wasn't long until I added a cheap 135mm - a Hanimex I think - which added greatly to what I wanted to do. So I'm not convinced by the hair-shirt ideology of just one lens, but that doesn't prevent my seeing its attractions. On this occasion I took only a Fuji X-E1 with a 35mm f/1.4 lens (equivalent to a 50mm on a full-frame camera).
800 ISO; f/5.6; 1/340th.