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Message: <blockquote data-quote="spb_stan" data-source="post: 646267" data-attributes="member: 43545"><p>The original 622 did not have a port for firmware updates and was not compatible with newer 560III and 560IV flash which built in receivers. The Yn622n II has been out for a while so any sold new for the last couple years would be the II version. It also works better on Rear Curtain which is important to me because I often shoot in dim events where to get ambient background exposure I use very low shutter speed, 1/6-1/20 sec and use the flash in delayed or rear curtain trigger so the subject is frozen and properly illuminated and the background is exposed well with just ambient light and more saturated colors. It is generally referred to as "Dragging the Shutter".  My Yn622n II transceivers work perfectly for this.</p></blockquote><p></p>