Diagonal mirror work with refractor and catadioptric telescopes;not for reflector telescope
Diagonal mirror body material is full metal; optical glass lens provide clear and sharp image With dust cover always keep your lens clear prolong life
SV135 7 mm to 21mm adjustable focal length; SV135 7-21mm zoom eyepiece equivalent to multiple eyepieces; obtain higher magnification with short focal length; It could bring you a better observation experience in a comfortable situation with high-contrast imaging
Fully multi-coated Premium eyepiece; The true fully multi-coated Premium eyepiece with superior edge and center sharpness than normal PLOSSL eyepieces; 6-Element 4-Group premium optical design for superior optical performance
SVBONY barlow lens provide a high power magnification allow you look more closely and more detailed at the moon's surface and other planet