1.The Svbony Super-wide Angle 1.25" 7.2mm-21.6mm zoom eyepiece allows you to change magnification power without swapping out eyepieces. 2.7-Elements / 4-groups made of high index glass deliver sharp, high contrast vistas. 3.Blackened lens edges, anti-reflection threads for maximum contrast. 4.Exceptionally long 18mm-20mm eye relief range allows for the use of eyeglasses without reducing the field of view visible through the eyepiece.
The eye piece works very well , it is nice not having to switch eyepieces, it has a nice range and is clear, easy to work, the diameter of the eyepiece is 2 inches and is a little big , my phone holder would not fit over it. That is the only thing that I could say is a issue for me.