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H-beta (486nm)
The 68° Series eyepieces are parfocal (meaning they focus at near the same point regardless of the focal length you select) and come with a removable and foldable soft silicone rubber eyecup for the comfort of the observer
observations of active regions of the sun
Crafted from durable plastic and secured with no-corrosion brass rivets
Optically polished glass with 1/4 wavefront guaranteed
2" Adapter for FFFR507X-00 Brand_National Geographic H-beta (486nm)This adapter allows you to attach the 3 inch 0. 7X Field Flattener Focal Reducer (FFFR507X 00) on optical tubes with a 2 inch focuser. Item Number 510364 Weight . 15lb . 08kg Diameter 76mm Height 36mm
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