20mm Nagler Type 5 Eyepiece 2 Inch -
The 20mm Type 5 is a compact eyepiece that fills out the eyepiece line and is a worthy successor to the heaviest commercial eyepiece ever produced: the Nagler 20mm Type 2 weighed-in at 2.3lb. when introduced in 1986.
EN5-20 - TeleVue -