Accepts AI lens mount. Update of FE which added: TTL OTF flash AE, titanium shutter, high shutter speed 1/4000, X- sync 1/250, improper exposure warning. Electronically controlled shutter speeds, however, there is a mechanical 1/90 setting. LED battery check. Stopped down metering with non-AI lenses. Recommended Accessories: Dedicated Flash: SB15, SB16B, SB18, SB20, SB21B, SB22. Backs: Data back MF16. Motordrive: MD12.