I was looking for this adapter for a year now, but prices offered more postage incited me to turn to a camera. I find this dealer product at a reasonable price (under 35 euros) and postage available. The installation of the device on a nexstar 4 is possible, provided you put it through. Simple operation and easy adjustment, even in the dark. Copy this link for a picture of my shooting with this tool (Nextar 4SE)