The Tele Vue PMT-5126 4-element 5x Barlow lens offers a unique imaging quality
1.25" barrel with filter thread4-element lens design for highest sharpness on the axis and in the fieldSharp edge image even with fast telescopesThe extension factor is retained even if the working distance is changed.Multi-coating on each glass-air surface for a bright image and high contrastIdeal for astrophotography when good sharpness is required throughout the fieldIs often used for H-Alpha telescopes to get the optimal aperture ratioAdapter and eyepieces are gently and firmly clamped by a compression ring