One of the best features of mirrorless cameras is the ability to use DSLR lenses. But when using DSLR lenses you immediately fall into one of the flaws of the DSLR lens system: filter design. The mix of filter thread sizes, ‘regular’, thin and extra thin filters and lenshood interaction makes you with there was a better solution.
Owl, “The World First Drop-in filter Adapter” aims to solve the filter problem for mirrorless once and for all with their new indiegogo. Most DSLR to mirrorless adapters are simply a hollow tube pushing the lens away from the camera. They are strong enough to carry a lens, while moving the electric contacts needed for focusing and feedback from the camera bayonet to the adapter bayonet. Owl simply makes a clever use of that space, adding a drop-in filter slot.