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Message: <blockquote data-quote="WayneF" data-source="post: 217391" data-attributes="member: 12496">I think they should all "fire" if in TTL mode (iTTL mode).  Again, simply shorting the foot center pin with a paper clip will do that, that is simply how hot shoe flashes are triggered.  No camera is required to just "fire" it. The Test button will "fire" it too, don't even  need the paper clip.  <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile    :)" loading="lazy" data-shortname=":)" />But there is is a lot more to TTL - there is no metered and programmed TTL intelligence without more elegant communication - to furnish a requested preflash to be metered, and then to accept the programmed TTL power level from the camera.</blockquote>