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If you're using an SB-24 or later and a modern Nikon body that doesn't have a built-in flash, you set fill levels on the flash. With your combo, you can set fill by pressing the Minus button on the SB-28 three to five times (-1.0 to -1.7 stops). However, there's a caveat. If you have the camera set to Program (P) exposure mode and the flash to TTL, you're in what is known as a "balanced" mode. In balanced modes, the camera tries to equalize the flash and ambient light levels. But, when everything is on automatic, the camera can only set shutter speeds of 1/60 to 1/250, which might not let the camera set the proper ambient exposure. In dim light, for example, the camera would underexpose the background (though the subject would be lit by the flash). Thus, if you dial in fill flash in this situation, both the ambient light and the flash would be underexposed, ruining your shot. So, the caveat is this: don't set fill flash levels on your SB-28 unless you know that the ambient exposure is going to be correct. For dim light, that may mean you need to set Slow or Rear flash sync; in bright light, that may mean you need to set High Speed (FP) flash sync.