Nikon - The First producer of a widely accepted professional 35mm sized digital SLR camera!
Until Nikon introduced the D1 camera, digital cameras were generally perceived as producing low quality and resolution pictures, they were of little interest to most professional photographers, the Nikon D1 SLR changed this perception for ever!
Nikon uses a "D" and a series numbers to designate it's digital SLR cameras, this may be followed by a H, S or X to identify variants of the basic models. Nikon digital SLR cameras with a single number are for professional use and are built like a tank with die-cast metal bodies and substantial weather proofing. Cameras with three numbers are semi pro, they still normally have die-cast metal bodies but are lighter and less robust with less weather proofing. Nikon digital cameras with two numbers are for amateur photographers and have light plastic bodies and virtually no weatherproofing. Cameras with four numbers are primarily for amateur photographers making the transition from a compact camera to their first digital SLR, they tend to be the lightest and least robust of the Nikon SLR cameras.