I wanted to create an easy way to switch out lenses on my Olympus Micro Four-thirds (M43, m4/3) digital camera. So I made these lens boards from an existing rear lens cap model. I can put all my lenses onto the boards, and just twist them on and off as needed in one step, with one hand, without fussing about the rear lens caps. Plus, they keep my lenses from knocking around and against each other in my bag. Pictured is my small Canon brand bag with 6 lenses mounted to a 1x2 and 2x2 board.