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I have iMac 2011 with ThunderBolt and MacBook Air 2011 with Mini DisplayPort. Can I connect them with a ThunderBolt cable? It is for work in Photoshop on two displays. Thanks!

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Is the MBA 2010 or 2011? – segiddins Jan 21 '12 at 21:38

To use Target Display mode with a Thunderbolt equipped iMac you need another Thunderbolt equipped Mac and a Thunderbolt cable [emphasis is mine]:

iMac (21.5-inch, Mid 2011) and iMac (27-inch, Mid 2011) support Target Display Mode via Thunderbolt to Thunderbolt cable (2 m) when the source is another Thunderbolt-equipped computer.

Source: iMac (Mid 2011): Target Display Mode does not work with Mini DisplayPort cable

If your MacBook Air has Mini DisplayPort then it will not work. More here about what options will work.

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