Televue 4X Powermate 2-1.25 Inch

Tele Vue Barlows: An Optically Perfect Window Properly Designed Barlows Do Wonderful Things. First, They Amplify Power While Retaining The Eyepieces Eye-Relief. Second, They Slow The Telescopes F/#, Which Improves Eyepiece Sharpness. Third, The Designer Can Introduce Compensations For Eyepiece Aberrations. The 4X Powermate Barlow Is A 4-Element Parfocal, Compact Amplifying Lens System. Powermate Consists Of A Negative Achromatic Doublet Plus A Positive Pupil-Correcting Doublet. While It Looks And Functions Like A Barlow, Your Eyepiece Will Operate With Pupil Locations Where The Designer Intended, Avoiding Mismatch Problems. Poewrmate Optimally Mates Its Power To Your Eyepieces. No Additional Interface Lens Is Needed, Since Powermates Have It Built-In. In Addition To Full Multi-Coating, Powermate Includes Other Tele Vue Special Touches Such As A Safety Undercut On The Chrome Barrell, And Captive Lock Screws That Cant Fall Out. Tele Vues 100% Qc Program At F/4 Insures That Powermate Will Add Dramatic Power (And Nothing Else) To Your Favorite Eyepieces. If, For Example, You Own A 22Mm Panoptic, Youll Have The Power Of A 5.5Mm With The 4X Powermate! The 2 4X Powermate Is Threaded For 48Mm Filters. Dobsonian/Newtonian Owners Using Tele Vues Paracorr Coma Corrector Should Place The 2.5X Or 5X Powermate (Or Tele Vue 2X Or 3X 1-1/4 Barlows) Into The Paracorrs 1-1/4 Adapter (I.E., Between The Para