The H in the F2H of 1978 denoted "High Speed". It was yet another titanium-armored F2 but this time with a fixed (not reflex), semi-silvered, pellicle mirror, manual lens diaphragm control and a mechanically matched titanium-armored Nikon MD-100 high-speed motor drive. The maximum shutter speed is 1/1000 (vs. 1/2000 for other F2 models). The self-timer and shutter settings 'B' and 'T' were omitted. The depth-of-field preview button was replaced with a 'Full-Aperture Viewing Button'. The Nikon MD-100 motor drive was a modified version of the MD-2 motor drive and was powered by the Nikon MB-100. The MB-100 consists of two MB-1 battery packs (20 AA or LR6 batteries, or four Nikon MN-1 nickel-cadmium rechargeable batteries, providing 30 volts), weighing a massive 960 g empty and reaching 10 frames-per-second film advance rate. The F2H set included the Nikon MH-100 battery charger. All components (body, motor and batterypack) may be detached from each other. The bodies (7-digit serial number) and motordrives (6-digit serial number) do not have matching serial numbers, contrary to often repeated misinformation. Body serial numbers began with 7850001, e.g. 'F2 7850001'. Approximately 400 units were produced making the F2H extremely rare, the rarest of any 'production model' F2, and valuable.