"An external power bank. For some steampunk events and science fiction conventions, I disguise my camera in other things, and I've been using external power because it often takes me 1/2 hour to remove the camera from the disguise to change the batteries."
OM System OM-1 | Olympus Zuiko Digital 14-54mm F2.8-3.5 II @ 27mm | F3.2 | 1/60 sec | ISO... more