Quick answer:
USB-C Luna unit required for 5K resolutions
HDMI Luna only supports up to 4K resolution
Auto-selects best resolution by default
Manual adjustment available in Luna Display Preferences
Up to 60Hz refresh rate supported (higher rates may come at a later date)
macOS Big Sur is required for 5K on Mac
macOS applies resolution scaling, such as 2560×1440 for 5K Retina iMacs, to maintain text and UI clarity. The display will still be 5K quality when using the scaled resolutions.
💡Luna Display now supports 4K and 5K resolutions on iMacs used as secondary displays when paired with a USB-C Luna unit.
By default, Luna will choose the best resolution for your setup, but you can manually adjust resolution and refresh rate in Luna Display's Preferences panel.
Luna Display relies on macOS to provide available resolution options, which are determined by the hardware capabilities and scaling settings of the connected device. Retina settings can only be used when connecting a Mac that has a native Retina display.
💻 Supported Resolutions
PC:
5K at 30Hz
4K at 60Hz
Mac:
5K at 45Hz
5K at 30Hz
4K at 60Hz
📝 Note: For Retina iMacs, macOS may default to scaling resolutions like 2560×1440 for optimal clarity. The display will still be 5K quality when using these scaled resolutions.
Luna Display currently supports refresh rates up to 60Hz. Support for higher refresh rates may be added in the future, but we do not have a timeline to share just yet.
⚙️ How to Manually Adjust Resolution and Refresh Rate
To manually change resolution settings, open Luna Display Settings and switch from Automatic to 4K or 5K depending on your needs.
You can also set your desired Refresh Rate. Choose between 30Hz, 45Hz, or 60Hz depending on your device's capabilities.
If you're using Computer-to-iPad mode and experiencing blur, try lowering your refresh rate or switching off Retina resolution depending on what your computer supports.
💡 Tip: If your secondary display looks blurry and your computer supports it, enabling Retina mode may help improve clarity. You can enable this on the main Luna Display window.