Features 1、5 X Magnification: Barlow lens increase magnification by 5 times, images will be clearer than the average increase in magnification, making it ideal for high magnification lunar and planetary observations and astrophotography. 2、Compatibility: Barlow lens with bottom filter thread is compatible with any 1.25in telescope eyepiece. Internal brass compression ring ensures secure and scratch free installation. 3、Achromatic Barlow Lens: 2 groups 4 elements optical lenses are fully extinction lenses with excellent color correction, sharpness and image brightness. 4、Enhanced Image Quality: Fully multicoated broadband green film provides exquisite images without additional chromatic aberration for clear and color correct views. 5、Two Dustproof Caps: Barron lens includes two end covers to protect against dust and fingerprints; Equipped with setting screws to secure the eyepiece. Specification Item Type: Barlow Lens Material: ABS+Aluminum Alloy+Brass+Optical Glass Magnification: 5X Interface Size: Approx. 1.25 inches / 31.7mm Structure: 2 Group 4 Element Package List 1 x Barlow Lens 2 x Dust Covers