micro-prism that read small numbers at the top of the mounted lens, of which type 'AI' (Aperture Indexing) or 'AIS' (Aperture Indexing Shutter Priority) lenses had printed behind the normal aperture numbers. Though widely used today, LCDs were very hi-tech at the time. They proved somewhat difficult to see at night, so Nikon installed a button-operated light for use at night. The LCD is one of the few problem areas of the F3 design, since with age, LCDs lose contrast, blur, and become inoperative after a number of years. Fortunately, unlike modern autofocus cameras with LCD 'Command Center' panels, malfunction of the F3's LCD viewfinder display does not prevent full operation of the camera, since this is accomplished with manual dials and indicators. Many F3 cameras built in the 1980s were never used professionally, and therefore are still in perfect working order, including the LCD. On early production models the autoexposure lock button, originally a simple push-in part, is often missing; Nikon later redesigned this part so it was securely attached from inside the body. The later part can be fitted to early bodies but a partial stripdown is required. The Nikon F3 was the last in the Nikon series of manual-focus, professional level 35mm SLR cameras. Its production cycle is generally accepted to be from 1980 to 2000 or 2002, close to a record for a high-volume professional camera. Its successor – the F4 – along with operating the two F3AF lens, featured auto-focus and new optional metering and modes, but retained the ability to mount older manual-focus lenses. The F3 was also the last F-Series camera to be offered without an integrated motor drive, making the camera smaller overall than its successors in the F-Series. The lasting appeal of the F3 remains the same as it was at its inception – a precision tool for those who prefer a less complex, extremely well made camera for continual use in extreme environments. The optional motor drive for the F3, known as the MD-4, contained either 8 AA batteries or a special NiCd battery pack that would be recharged. Its performance surpassed that of past Nikon models, with a capability of 4 frames per second with uninterrupted reflex viewing, or 6 frame/s with the reflex mirror locked up. The integral seamless design of the MD-4 motor drive made it an extremely popular option for many F3 users. A bulk film