Like it or not, mirrorless is where the majority of the industry is headed (or has already arrived). And while that means you will eventually have to upgrade your camera bodies, the situation with lenses is a bit murkier, particularly since they generally have much longer useful lifespans and there are many adapters available. This interesting video takes a look at an extremely challenging situation for bird photographers, offers some great tips, and shows you how adapted lenses rise to the challenge.