June 20, 2012, 12:25 PM — Here's how you can use a quick keyboard command to give you finer control over the screen brightness of your Mac.
1. Press and hold the Shift and Option keys.
2. Press the F1 key to lower the brightness or the F2 key to increase the brightness.
3. You'll notice that the brightness increases or decreases by smaller degrees than if you adjust it without the Shift-Option modifier.
This is a fast and easy way to have better control over the brightness of your Mac's screen.
For more, see the original article at the link below.