Product Features：

1.2-Element optics are fully multi-coated

2.The Edges of the lenses are blackened to cut down on internal reflections

3.The 1.25” barrel will fit in standard 1.25” focusers and diagonals

4.Internal brass ring that the set screw hits to hold your 1.25" eyepiece inside for eliminates marks on your eyepiece barrel

Note:

Insert Barlow Lens between your eyepiece and your telescope to get the magnification instantly. Eye relief is the distance your eye has to be from the first lens in the eyepiece in order to see the full field of view. When you use a Barlow lens with an eyepiece, you get the magnification, but the eye relief is not affected. This is a good thing, because normally the shorter the focal length of the eyepiece, the less eye relief you have.

Brass compression ring

A brass compression ring just inside the top of SV137 barlow grabs your eyepiece gently but firmly when you turn the screw. Once the screw has been secured in place, the brass ring keeps your eyepiece in the Barlow instead of relying on the tip of the screw itself, protecting the barrel from scratches