High-Power 1.25 Inch 2X 4-Element Barlow Lens This 4-Element 2x Barlow will give your 1.25" telescope eyepieces a power-doubling magnification boost Sophisticated fully multi-coated, 4-element lens design renders exquisite images without introducing additional chromatic aberration for crisp, color-correct views Enjoy twice the power while maintaining comfortable eye relief and edge sharpness of longer focal length eyepieces Great for high-magnification lunar and planetary observations and astrophotography Brass compression ring keeps eyepieces securely installed without scratching, and the barrel is threaded for use with 1.25" Orion filters