While focusing your camera seems like it should be a no-brainer—there’s autofocus, after all!—it’s often not a simple task. Depending on the shooting situation, your camera, and the countless scenarios that can “throw off” the focus, the task of achieving sharp images with great focus can be deceptively challenging. If you’re a passionate photographer eager to learn the best ways to achieve tack-sharp focus in your images, these 50 focus-based principles are exactly what you need to take your work to the next level. With photographer and author John Greengo as your guide, you’ll quickly learn nearly four dozen techniques for achieving focus in every shooting situation.