The zoom eyepiece is designed to provide the best balance of contrast, comfortable eye relief, and resolution for the critical planetary observer, particularly those with ultra-premium short focal length refractors.
6-Element/4-Groups, Fully Multi-Coated optics for remarkable sharpness, contrast and color correction.
Fold-down rubber eyeguard and a rubber grip ring.
2. SVBONY SV216
1.25" 2X 4-Element Barlow Lens for Imaging Visual Applications
Increase Your Magnification Without Sacrificing Magnification Factor or Eye Relief: When using a barlow to increase magnification, get to enjoy the generous eye relief of the lower power eyepiece, especially for eyeglass wearers or for those with fast telescopes. The distance is changed, the magnification remains the same. Can place barlow anywhere along the optical chain between an eyepiece or a camera.
Tapered Barrel for Extra Security: The insert barrel of each extender is double-tapered to allow smooth insertion to, and removal from, a telescope's eyepiece holder, focuser or diagonal, however the wide dimension of the taper helps prevent the focal extender from falling out of the telescope should the set-screw holding it in place become loose.
The SV213 1.25" 3xBarlow lens is an air-spaced, fully multi-coated 3-Element, apochromatic design.
The housing is precision machined from aluminum stock and black anodized to a hard finish.
The Barlow lens has a compression ring that doesn't leave any marks on cameras or eyepieces.
The lenses are edge-blackened to eliminate internal light scatter to maximize image contrast.
Fits any 1.25" focuser or diagonal, recommended for planetary and lunar imaging and visual observing.
Hope you will like them!