Explore Scientific 3X Focal Extender - 1.25" - FE03-125 7X Binoculars and an IP67-Rated Carry Case

and an IP67-Rated Carry Case

Then here you go

About the Celestron Luminos 2" Barlow Lens

Phase and Dielectric Coated

high-power barlow lens increases the magnification of any eyepiece by 3x

Explore Scientific 3X Focal Extender - 1.25" - FE03-125 7X Binoculars and an IP67-Rated Carry CaseAbout the Explore Scientific 3X Focal Extender 1. 25" An Explore Scientific Focal Extender does exactly what the name implies; it extends the effective focal length of the lens that it is used in conjunction with, thus producing higher magnifications for imaging and visual applications. Focal extenders are similar to a Barlow or tele negative lens, but there is one important difference between the two that you will want to take into consideration,