The lack of obstruction also eliminates the diffraction associated with cassegrain and newtonian reflector astrophotography. Newtonian reflector solidly fixed on a polar mount. Newtonian reflector by Grubb Parsons, electrically driven. In 1721 he showed the first parabolic Newtonian reflector to the Royal Society. The primary instrument in use is a 130-year-old equatorially mounted 230mm With-Browning newtonian reflector telescope. The original telescope was a 16-inch Newtonian reflector built by Mr L. Jeffree of Bendigo.