TeleVue 3x Barlow BLW-3125 are designed to amplify power, lengthen the telescopes f ratio (improving sharpness) and help to correct for aberrations. Most importantly for eyeglass wearers, a TeleVue 3x Barlow BLW3125 increases the magnification of long eye relief eyepieces.
TeleVue 3x Barlow BLW-3125 and TeleVue 2x barlow offer parfocalization (no need to refocus when switching eyepieces) and are fully multicoated. TeleVue Barlows also feature filter threads and captive lock screws.
Specifications for TeleVue 3x Barlow BLW3125: