Originally Posted by
Mike Buckley
As Grahame as already alluded to as I understand his post, you can probably see a pertinent indicator displayed in the viewfinder. If your camera works as mine does (also a Nikon camera), the viewfinder will display that the ISO value to be be used upon capturing the image will be higher than the lowest ISO value you have configured your camera to use. However, it won't indicate the exact value to be used, only that it will be higher than as configured.
Depending on your camera's capabilities, you may be able to custom configure one or two buttons to display the actual ISO the camera will use upon pressing the configured button.