Farpoint 1.25 Inch T-Ring Prime Focus AdapterFarpoint 1. 25 Inch T Ring Prime Focus Adapter standard 1. 25 t adapter fits on any telescope that uses a 1. 25 eyepiece focuser for prime focus photography. Farpoint 1. 25 Inch T Ring Prime Focus Adapter Farpoint 1. 25 Inch T Ring Prime Focus Adapter standard 1. 25 t adapter fits on any telescope that uses a 1. 25 eyepiece focuser for prime focus photography. Simply drops into 1. 25 eyepiece holders and presents male T threads (42mm x 0. 75mm) for T