Standard 1.25 inches; quality SVBONY SV137 1.25-inch 2x barlow lens doubles the magnification of any 1. 25" eyepiece
Double glued lens set; the true FMC coating process ensures that each exposed air lens surface is fully broadband coated to ensure adequate transmission and image quality
Brass ring design; the built-in brass pressure ring on the eyepiece insertion end ensures that the inserted high-end eyepiece lens body surface is not accidentally scratched
Dielectric coatings; super flat mirror with dielectric coatings to reduce reflected light loss; provide an over 99% reflective surface; good for astronomical viewing
1.25 inches nosepiece fits 1.25 inches telescopes; accepts standard 1.25inches filters; eyepieces; barlow lenses and other accessories with a 1.25inches insert barrel