2x Powermate 2". This new model is nearly parfocal (unlike the Big Barlow/Interface combination), so it can be effectively used in TeleVue 2" diagonals. It's performance is excellent with every 1.25" or 2" eyepiece TeleVue makes (even the 31mm Nagler Type 5!). Both the 2" eyepiece holder and the special 2"-1.25" low-profile adapter use brass clamp rings for secure, non-marring operation.
This barlow has a unique feature: you can unscrew the 2" eyepiece housing and screw on a special T-ring adapter (sold seperately) for solid, compact attachment of CCD or camera equipment.