
Nikon developed and introduced its first single lens reflex camera, the Nikon F, as a system camera. The camera body can be ‘dressed’ with a great variety of lenses, finders, backs, motor drives and other accessories. Nearly everything could and can be exchanged.
When new a camera was fitted with one standard view finder screen. Depending on the photographical burden that had to be tackled the photographer could exchange certain parts, including the viewfinder screen. All later Nikon SLR’s - with just a few exceptions - have the possibility to exchange the viewfinder screen. For macro-, micro-, tele-, available light - or whatever photography a special screen was developed and supplied. Up to 22 different screens for just one camera!
Not all Nikon SLR cameras, like some Nikkormat models, the Nikon EM and some
digital SLR’s, are featuring exchangeable viewfinder screens. Modern
SLR cameras (for film or digital) have - however - the possibility to ‘project’
in the viewfinder a grid screen. That grid screen, based on the screen Type
E was and still is the most wanted viewfinder screen, as it enables the photographer
to level the camera.
In fact the viewfinder screens mentioned here are little lenses. Most of the viewfinder screens consist of two lenses hold together in a metal frame. In one or both lenses fresnel* rings and various focus aids are grinded and/or engraved.
* Fresnel (speak: frèh-nell) comes from its inventor, the French scientist Augustin Jean Fresnel (1788-1827).
Nikon didn’t invent difficult names or codes for the variety of screens; it just took the Latin alphabet, starting with A.

And - luckily - all screens of a certain design, no matter what camera it was made for - kept the same letter. The grid screen, which is available for nearly each Nikon SLR, is always named E. Some screens can be used in different (more than one) cameras. Sometimes there are some limitations. There are also some screens which demand a tiny change in the camera (exposure program) settings. And certain screens can only be exchanged with the help of a tool, which normally comes with the screen. The professional SLR cameras, like the Nikon F up to the Nikon F6 have the largest choice. Finally: not all versions are available for all cameras.
Below the screens are listed, including indications (in a matrix) for which camera(s) they are made for. If a camera isn’t listed at all, there is no exchangeable screen made available or that camera has the possibility to project a screen in its viewfinder. In all camera manuals (in chapter ‘technical specifications’) one can find either all or non-available screens.
The screens available for the Nikon F, Nikon F2, Nikon F3, Nikon F4 and Nikon F5 can be exchanged by removing the viewfinder. By unlocking the screen it will drop out of the camera body (when hold upside down). Screens of other cameras can be exchanged via the lens mount, by pressing or lifting a small tab.
See for a list of known screens (made by Nikon) here