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You will probably get as many different recommendations as you get answers. The F3 came standard with a Type K screen-which Nikon described as a Matte/Fresnel field with 3 mm split image rangefinder spot surrounded by 1 mm-wide microprism doughnut. That split image being horizontal. Great if you want to focus on something with an obvious vertical line, but that isn't always available in every composition.
Responding to a request from the US space agency NASA, Nikon developed a screen called a Type P, same as the K except the split image was on a 45 degree angle. There is always a line which is broken by something that is on a 45 degree angle. I had one on my F2 and found it very easy to use.
Shown here, along with other options:
http://mir.com.my/rb/photography/hardwares/classics/nikonf4/screens/index.htm
If you have not done so, pop off the prism on the F3, and you can flip the focusing screen out(release it first), and there will be a letter printed on your screen, which identifies it's type.
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