I bought a Nikon D5300 and a Yongnuo YN565-EX. Can I use the flash off-camera using any mode or something without a separate trigger?


You can use the Yongnuo YN565EX in Optical Slave mode, where it will detect and be triggered by another flash (for example the built in flash of the Nikon D5300). You would need to have the built in flash firing, and you can enable optical slave mode on the flash (S1 and S2, depending on whether you want it to ignore the TTL pre-flash). Take a look here: http://www.davidpartington.com/m43/2014/12/16/yn568ex-ii-remote-slave-mode/ for information on the optical slave mode.

Remember that the master flash on the camera will need to be bright enough that it can be detected by the Yongnuo slave, and also if the camera is using TTL metering and you've set the Yongnuo slave to ignore the pre-flash, the camera is not going to be able to meter properly, so you will need to separately take that into account.

As an aside, you might consider investing in a wireless trigger. If you want to do it cheaply, Yongnuo triggers are very good for the price.

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    And note that you do want it to ignore the TTL pre-flash — I don't think there's any way to disable that with the built-in popup flash. – mattdm Jul 20 '17 at 14:49
  • @mattdm oh really? Does it still use the pre-flash even if shooting in manual mode? I didn't realise that (my camera doesn't even have a flash) – laurencemadill Jul 20 '17 at 15:10
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    I'm actually not sure with Nikon these days. I'll let someone who does know weigh in. The camera I use also doesn't have a pop-up flash. :) – mattdm Jul 20 '17 at 15:25
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    The D5300 doesn't do CLS, so it doesn't have a commander mode or do pre-flash. On bodies that do, there's a custom setting that determines whether the built-in flash operates as a plain flash or flashes out the TTL data before the exposure flash. – Blrfl Jul 20 '17 at 15:52

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