|Nikon F2S 50mm f1.4 Fomopan 100 Classic|
I took this with a Nikon F2S:
|Nikon D7000 55mm f3.5 microNikkor|
There were many improvements from the F with this camera, such as a more rounded (and therefore more comfortable) body, battery compartment moved to the body from the prism, faster top shutter speed, swing open back (as opposed to removable), larger mirror, etc. It is a beast, weighing about 37 pounds. Well, maybe not that much, but it is quite a hunk of metal.
There were a bunch of prisms released over the years. The DE-1, the pretty, unmetered prism makes it an F2. The DP-1 (which is on my other F2) has a match needle meter and makes an F2 Photomic. This meter is the DP-2 and has two LEDs inside which show over, just right and under exposure. An F2 with DP-2 is called F2S. There were also the DP-3, DP-11 and DP-12 which offered various improvements like silicon photodiodes, 5 LEDS, and for the latter two, compatibility with newer "AI" and "AIS" lenses. I don't have those prisms though I'd like to.
My particular F2S came via EBay as a 'not working' parts camera and included a 35mm f2 lens which had 'fungus'. Needless to say, it now works and the lens is fungus free and I got an F2 AND a super nice lens for under 40 bucks.