Photo buffs love SLRs because the optical viewfinder shows exactly what the camera sees. But sometimes a point-and-shoot is more convenient. Its LCD is great for framing awkward shots where you can’t get your eyeball up to that little window, such as holding the camera high to shoot over a crowd or low to snap pets. Sony’s new high-end cameras deliver the best of both worlds: an SLR with a fast, accurate digital-preview option.