National Geographic 50Mm Portable Refractor Telescope - Rf360Mm50mm Lens Diameter | 360mm Focal length | 18x and 28.8x Magnification | 24.5mm Eyepiece | AZ Panhandle Mount, aluminum tripod, and astronomy softwareFeatures of National Geographic 50Mm Portable Refractor Telescope - Rf360Mm 50mm Lens Diameter360mm Focal length18x and 28.8x Magnificatio..

Explore Scientific Fokal Extender - Barlow Lens to Increase The Focal Length for TelescopesWith teleextenders it is possible to extend the effective focal length of a telescope system, resulting in higher magnification for the observation of the moon, the planets or small Deep-Sky objects with the same eyepieces So you can use the advantages of eye..