1982-89. AE bayonet lens mount. (1-PX28) Same as RTS except: now with titanium shutter, AE lock added and all shutter speeds electronic quartz timed. TTL flash metering, manual metering and aperture priority metering modes, LED meter display, AE exposure compensation and AE lock, dedicated hot shoe, PC sync terminal. Shutter speed range 4 sec to 1/2000 plus B and 1/50 mechanical shutter speed setting in manual mode. 16 sec to 1/2000 stepless in AE mode. X sync at 1/60. Self timer, multi exposure capability, mirror lock-up, interchangeable focusing screens (FS series), removable back, DOF preview, elec. cable release. Backs/Motors: Data Back D-4, Pro Motor W-6, Real Time Winder W-3, optional remote control available. Recommended flash: 540, TLA-20, TLA-30. Also new: diopter adjustment and eye piece blind.