The Nikon SB-800 has fully manual operation that'll work with any camera, an onboard reflected light sensor that'll work in "Auto" with any camera, AND a TTL Optical Slave function that works beautifully to synch (and automatically quench) with just about any old OTF dedicated flash mounted in a hotshoe. I even use mine remotely with Yongnuo triggers mounted on a Pentax 645N to wake them up from sleep for long nighttime remotes. Extremely versatile units, if a bit spendy.