Antares 9.1 mm Speers-Waler Series 4 Eyepiece - 1.25" - SW9S4 Sky-Watcher Dobsonians The hand controller module is

The hand controller module is very compact and fits easily in the palm of your hand

Add an optional solar filter and you can observe activity on the Sun

Secondary Mirror Obstruction by Diameter: 35%

Low temperature operation as low as -20ºC

Antares 9.1 mm Speers-Waler Series 4 Eyepiece - 1.25" - SW9S4 Sky-Watcher Dobsonians The hand controller module isAntares 9. 1 mm 1. 25" Speers Waler Series 4 86 Eyepiece Product Highlights: Antares Speers Waler Type Series 4 Eyepiece 1. 25" Barrel, 9. 1 mm Focal Length, 8 Element Eyepiece 86 Degree Apparent Field of View (AFOV) 10 mm Eye Relief Includes Eyeshield Includes a Rubber Grip for secure handling Optics are Fully Multicoated The Antares Series 4, Speers Waler Eyepiece is a superb quality eyepiece with a focal length of 9. 1 mm and an AFOV of 86. It is a