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over 3 years ago from Teodor Decu, Product Designer
I did this also. Kept my 2015 macbook and bought a new 2019 imac. Haven't looked back. If I need extra screen space I use duetdisplay to use ipad as second screen. I think this will also allow for a macbook to act as the second screen.
Mh, so in the new OS there's only an option for an iPad as 2nd display, not another mac ?
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Seconding the suggestion of just getting an iMac 5K. As I mentioned below I just ended up getting a gently used 2017 iMac and work off of that -- $300 cheaper than LG Ultrafine 5K but with a Mac attached. (And less ugly, IMO.)
Just a clarification that "iMac (Retina 5K, 27-inch, Late 2014) and later iMac models can't be used as Target Display Mode displays" (support.apple.com).
It looks like you might be able to use a Luna Display dongle (~80 USD) to connect use a MacBook Pro with an iMac as an external display (or vice versa?). I've used Luna to turn an iPad into an external display (recently Sherlocked by Sidecar), but never tried Mac-to-Mac connection, so can't speak to its reliability.