This Barlow come with a set screw to secure holds your eyepieces works on most brand of Advanced achromatic lens, super sharpnesses and color corrections, opticals component, real physical computings magnification It increases the magnification, the picture will be clear than the average increase in magnification up to 15 time the picture clarities 3x Barlow the magnification of any 1.25 ” eyepiece 3x power any 1.25 " eyepiece with the universally barlow lens for owner of fast short nuclear length telescopes Compatibles with most 1.25inch diameter eyepieces Includes both end hat to protect against