2.8. Spot Meter
Sometimes no other meter but a spot meter will do. In situations where you must get an accurate exposure for a very small section of the frame, or must get several meter readings from different small areas, the D300 can, once again, be adjusted to fit your needs (Figure 4).
The D300's Spot meter consists of a 3mm circle surrounding the currently active auto focus (AF) point. That's evaluating only 2% of the frame, so it is indeed a "spot" meter. Since the spot is surrounding the currently active AF point, you can move the spot meter around the viewfinder within the 51 AF points (Figure 4A).
How big is the 3mm spot? Well, the spot meter barely surrounds the little AF point rectangle in your viewfinder. It is rather small at .11 ...
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