New, old, discontinued, obsolete, incompatible. Tech is all of this. They upgrade the iPhone and Macbook Pro every year so that I will have envy and soon be obsoletely completely behind. Nikon flash? The technology has changed little. The connector remains the same. I can use my trusty old flash since forever (>10yrs old) even though it is outdated and discontinued. Huh!?! Anyway, the darned flash still works atop my spiffy new camera. I fully expected to be buying a new one. eBay – cheap <$100. Amazon – new, $499. Or, used – about $120. A bargain! But, I have a flash (already)! And, it works! How fortunate am I? All they had to do was change the connection, and, I’m upgrading – see (for example) Apple! They (Apple) change connectors and the whole world has to follow them.