Review of all Nikon F3 focusing screens Jerry Lodriguss' site. The screens are the F3's, but the F4 screens are very similar to the F3's. Do note, however, that the F3 screens can be used on the F4, but the F4 screens cannot be used on the F3. Here, I don't have any links to exposure resources. There is no one exposure that would work every time.
Exposure is very dependant on the sky conditions at the time of picture taking.
Personally, I practise this art to the extreme. So far, it has worked pretty well. In fact, ironically, during the annular solar eclipse of 1998, I spent considerable effort researching on the proper exposure needed for the sun, but it turned out that all my photographs were at least slightly underexposed. Unfortunately, I'm no expert in the behaviour and nature of film emulsions. I do use slide film nowadays quite often, because I'm quite tired of getting washed out prints from poor developing stores.