Macs generally tend to hold their value quite well on the used market, but sometimes you just don’t want to get rid of your old computer when you get a new one. If you rely on photography for your income, having a backup can be vital, especially given the number of repairs and recalls Apple seems to have going on.

But if you don’t want to just leave your old Mac sitting there doing nothing while you work on your new one, you can turn it into a secondary monitor, thanks to the latest version of Luna Display and its new “Mac-to-Mac” mode.

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