Have you ever tried changing lenses on a DSLR, in a situation where you had to keep hold of the camera the whole time? The problem is that it essentially requires three hands. You need two hands to twist off the old lens and put its rear protective cap on, and to un-rear-cap the new lens and twist it onto the camera – your non-existent third hand, meanwhile, is required to hold the camera body. Because photographers are in reality limited to two hands, they instead perform a sort of awkward juggling act, in which they risk dropping the camera or one of the lenses. The Backer Capper, however, is a product-in-development that’s designed to make the task considerably easier.
Read the full article: Backer Capper allows for one-handed lens-swapping