Nikon F4 (F4) spotmetering (spot metering) / Exposure / Operational cheat sheet
Distinct Spot Frame 5.00 mm in Diameter 2.3%  of View Finder Area 5.80° with 50mm lens
10.2° degrees with a 28mm lens 
5.7° degrees with a 50mm lens 
4° degrees with a 70mm lens
1° degree with a 286mm lens  

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