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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
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,
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."
Those Mac's do not support a cabled Thunderbolt Display connection.
If you use Screen Sharing, DuetDisplay, LunaDisplay, then it will be over a slower network connection.
Second Display for DuetDisplay App.
