Erik van Straten
Veteran
The meter of the Nikkormat FTn was the same as the one in the Nikon F Photomic. With those meters it was very hard to make a wrong reading.Every exposure medium, whether film or digital has a dynamic range to its ability to capture an image. The dynamic range of Tri-X Pan ran around 10 stops. The current Sony sensor run . . .I don't know. 13 stops? 14 stops. Think it like a bell curve with your chosen exposure in the middle. You use your shutter speed and aperture to correctly expose your image. That will determine what's the "middle of your bell curve." And the dynamic range of the medium will determine what else is acceptably exposed on either side of the exposure value you have chosen with your shutter speed and aperture.
But choosing ISO 400 doesn't overexpose your highlights all by itself. Your choice of aperture and shutter speed does. Now it is possible to set your exposure for, say, a backlit subject standing against a window, exposure correctly for the subject's face and lose detail outside the window in the background. That's how dynamic range can limit you, and there are ways to deal with it, up to a point.
Erik.