The Lensbaby Composer is a lens housing with a ball and socket design that allows the lens elements to pivot on the ball to move the sharp-focused area around the frame. It comes with a Double Optic lens, which has a curved field of focus that delivers selective focus with a sharp Sweet Spot surrounded by blur. Reviews say the Composer is easy to use, can get decent shots right away, and has aperture disks that allow creative control over the shape of highlights. However, reviews also note that the corners remain soft at all apertures