The Takahashi Extender-C2X is designed for the FS and FC Series of telescopes. It increase the focal length of these instruments without degrading the optical performance. This extender is compatible with the FS-60CB, FC-76D, and FC-100D telescopes.
Vixen Extender R 2X extends the focal distance of optical tube by 2x. For R135S：720→1,440mm(F10.7), for R150S：750→1,500mm(F10). Enables observation or photography at a higher magnification with your current eyepiece.