This is a 1st generation TeleVue Radian with 6mm FL. It is an excellent optical performer with good eye relief but I don't use it since it is too close in focal length to my 7mm eyepiece.
Now $150 shipped.
Last edited by PhilW; 26-05-2017 at 12:03 PM.
Reason: Sold
Previous posts on IIS indicate that the 1st and 2nd series Radians are distinguished by the lower black section. In the 2nd series the lower black section was smooth instead of 'knobbly'. The attached picture indicates a 1st gen model.