Explore Scientific 3X Focal Extender - 1.25" - FE03-125 7X Binoculars high-power barlow lens increases the

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

Then here you go

It’s equipped with an integrated rotation mechanism for polarizing filters

The lenses of the Sky Mentor 3X Five Element Barlow Lens - 2" are fully multi-coated to ensure high light throughput

and #80A (blue)

Explore Scientific 3X Focal Extender - 1.25" - FE03-125 7X Binoculars high-power barlow lens increases theAbout 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,