[Jeff]

Yes, 2" Nagler eyepiece.

Barrel end has a slight flat spot (approx 1mm inwards) near the threaded edge where a filter would normally attach. Because internal barrel thread has this flat spot, it's difficult to screw a 2" filter on. Somebody handier than me could probably remove the flatspot if they really wanted to use with filters.

Optical performance in my scope is excellent (f/5 LightBridge) ... bright contrast and very flat filed across full 82 degrees - zero coma perceptable.

I have decided to go with 2 Naglers (5mm, 13mm) and 2 Panoptics (19mm, 27mm).
(The Pan 19mm being 1.25" is much smaller and lighter than the Nagler 20mm).

Cheers, Jeff