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If you have multiple screens or would prefer to use a slider, you can precisely adjust the brightness of a connected Mac display with the System Preferences, just go to the “Displays” preference panel and under the ‘Display’ tab adjust the slider to the brightness level desired. How to Adjust Mac Screen Brightness through Display Panel in Mac OS X Note that new versions of Mac OS still allow for this feature, but with Lion through Yosemite and Mac OS X El Capitan, Mojave, Catalina, etc a slightly different modifier key is required for the incremental precision adjustments using the function keys for volume levels and brightness levels on the newest Mac keyboard. You can do the same type of precise adjustments when changing your Mac volume levels too, which also offers the incremental controls through the same keyboard modifier trick. I find this kind of precision really useful on my MacBook Pro when in dimmer lighting conditions, but it works on desktop Macs too, and with just about every version of Mac OS X. The incremental adjustment allows for precision when setting a screen brightness level, offering tremendous control over exactly how bright or dim you want the Mac display to be.Īs you can see in the screenshot, this is done by breaking each brightness step into four stages. Hold down the Option+Shift keys while you adjust screen brightness to precisely adjust the displays brightness by allowing you to have 64 levels of varying brightness vs the default 16. Precision Adjustments with Option+Shift Brightness Buttons on Mac Keyboards First is a handy and little-known keyboard modifier that allows for precision adjustment, and second, we’ll show how to access the brightness slider in Display preference panel.