The UR-4 eyepiece adapter has a 30mm connection thread. It fits into the thread of the K30 opticsrail of the Smartoscope Vario adapter or on one of the Kowa individual adapters for smartphone digiscoping.
Three rubber spacer strips are included for eyepieces with a smaller diameter. Depending on the combination of these strips, there is an application range diameter of approx. 46mm to 63.7mm.
