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Second Display for DuetDisplay App.

I am currently working on a Mac Studio 2022 with Apple M1 Max (running Sonoma 14.3.1)and a Studio Display. Can I use an iMac OS 17.1, which is running Catalina 10.15.7, as a second screen? (for the connection I have a Thunderbolt Cable and a Thunderbolt 3 to Thunderbolt 2 adapter. Would you recommend the DuetDisplay application between the to Display?

Mac Studio, macOS 14.3

Posted on Jul 16, 2024 7:29 AM

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2 replies

Jul 16, 2024 8:39 AM in response to Szakra_Studio_Kft

If you mean that your iMac has model ID iMac17,1 – that would make it an iMac (Retina 5K, 27-inch, Late 2015).


I could be mistaken, but I don't believe that DuetDisplay supports 5K resolution. Luna Display does, but if I'm not mistaken,

  • The 2015 iMac would need to be running Big Sur or later (I believe you can upgrade it as far as Monterey)
  • Refresh rate would be limited to 30 or 45 Hz even with a cable connection to help carry data
  • Astropad themselves acknowledge that using Luna Display to drive a 5K display has some limitations


Astropad – Use Your iMac as a Monitor: A Step-by-Step Guide [2024]


"Like any product, Luna Display does have limitations and it’s not recommended for high-motion content. For example, I wouldn’t recommend using Luna Display for gaming or video editing.


Since Luna Display is squeezing a 5K display through a USB cable, when lots of motion occurs on-screen (like from video playback or moving a window quickly) the screen can temporarily become pixelated before it renders in at full resolution."

Second Display for DuetDisplay App.

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