• 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
• 18mm - 16.3mm comfortable eye relief; especially for eyeglass wearers ;designed primarily for viewing landscapes and astronomical observations of lunar surfaces; planets; nebulae; clusters; and diffuse nebulae
• 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
• Standard 1.25" eyepiece;Equipped with a precision-made standard 1.25-inch lens barrel that is compatible with any telescope that accepts 1.25-inch eyepieces; Rubber eye guard for comfortable viewing and blocking stray light
• A cost-effective eyepiece;Full metal body; fine appearance; 40 degree - 57 degree wide angle field of view; high brightness observation is very comfortable ;you will obtain more details that you have never seen before