Alstar 2 Inch Telescope Eyepiece Extension Tube Adapter Optical Length 80Mm With Standand 2 Inch Filter Threads Motherboards -High-Quality Materials

-High-Quality Materials

* Compliant with IEEE 802

* Capacity: 41Wh (3615mAh)

fire-retardant plastic with gold-plated contacts for enhanced safety

Alstar 2 Inch Telescope Eyepiece Extension Tube Adapter Optical Length 80Mm With Standand 2 Inch Filter Threads Motherboards -High-Quality MaterialsAlstar 2 Inch Telescope Eyepiece Extension Tube Adapter Provide Extra Focuser Back Travel Sometimes Needed To Achieve Focus With Certain Eyepiece Or Telescope Combinations. More Back Travel Is Often Needed For Short Range Terrestrial Viewing Or With Use Of A Field Flattener, Coma Corrector, Or Focal Reducer Lens. Extension Tube Provides Extra Focuser ''Back Travel'' Often Needed For Short Range Terrestrial Viewing Through A Telescope, Or For