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Powermates are a better choice for 2" diagonals than Barlows, since they are nearly Parfocal. They are threaded for 48mm filters and their performance is excellent with every 1.25" and 2" eyepiece Tele Vue makes (even the 31mm Nagler Type 5). Both the 2" eyepiece holder and the special 2" flat top adapter use brass clamp rings for secure operation. And, it also has a very unique feature: you can unscrew the 2" eyepiece housing and screw on a special T-ring adapter for solid, compact attachment of CCD or camera equipment.
Excellent with long eye-relief, 2" eyepieces. Using the 4x model, imagine the quality of a 35mm Panoptic at 8.8mm with 25mm of eye relief! The Powermate is NOT a Barlow so the Panoptic-Barlow Interface is not needed! The 2" Powermate fits all the way into 2" Star Diagonals, requiring minimal refocus compared to a 2" Barlow.
Note for Dobsonian/Newtonian Owners: For 2x and 4x 2" Powermates, first insert the Powermate into the focuser, then the Paracorr into the Powermate.
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