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Message: <blockquote data-quote="dukatum" data-source="post: 307124" data-attributes="member: 23829">I am with a RF-603N and it works a treat, but I don't think it's likely to be the cause behind the flash popping up as that's controlled by your camera and not the transceivers.It's good you are on manual mode in studio, anything else wouldn't be wise because you'll either break your sync speed (being in A mode), or you have no control over your aperture (in S mode). Maybe it's worth <a href="https://support.nikonusa.com/app/answers/detail/a_id/17395/~/how-to-reset-a-d-slr-to-factory-default-settings" target="_blank">resetting all your settings</a> on the camera, then do some tests with and without the 603 attached.</blockquote>