CENTER-WEIGHTED/SPOT FILL-FLASH

If you are using a lens without CPU (a lens other than AF Nikkor and AI-P-Nikkor), Center-Weighted Fill-Flash and Spot Fill-Flash are performed as Automatic Balanced Fill-Flash. Although the TIL Multi-Sensor is not used, flash output is properly compensated to produce a natural fill-flash effect.

STANDARD TTL FLASH

In Standard TIL Flash, automatic flash output level compensation is not available. This means that, although the main subject is correctly exposed, the background may not be. With SB-25 or SB-24, Standard TIL allows you manual selection of flash output level compensation instead of having the computer do it automatically. So, with SB-25 or SB-24, you can intentionally cancel Automatic Balanced Fill -Flash by pressing the Speedlight'sM button.

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Nikon N90 instruction manual Center-Weighted/Spot Fill-Flash, Standard TTL Flash, 115