The Nikon Z series of mirrorless cameras current consists of the $1,800 Nikon Z6 and the $3,400 Nikon Z7, but get ready for a third camera. Nikon will reportedly be announcing a “mid-level” Z mirrorless camera that may cost as little as $900. Nikkei is reporting that Nikon plans to announce the new camera in the 2019 fiscal year. Here’s a translation of the lead paragraph: Nikon will introduce a new mid-price mirrorless camera product in fiscal 2019. The same…