Alstar 2 Inch Telescope Eyepiece Extension Tube Adapter Optical Length 80Mm With Standand 2 Inch Filter Threads Motherboards * Capacity: 41Wh (3615mAh)

* Capacity: 41Wh (3615mAh)

* Compliant with IEEE 802

* Temperature Range: Operates effectively between 5℉ and 140℉ (-15℃ to 60℃)

- ADAPTIVE SOUND: Benefit from dynamically optimized audio with enhanced voice clarity

Alstar 2 Inch Telescope Eyepiece Extension Tube Adapter Optical Length 80Mm With Standand 2 Inch Filter Threads Motherboards * Capacity: 41Wh (3615mAh)Alstar 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