Tele-vue New 5x Powermate Barlow lens 1.25 - T Ring (pmt5126)

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 2.5X 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. Minimize