Orion 7216 1.25-Inch 45-degree Correct Image Prism Telescope Diagonal For terrestrial or astronomical use, this diagonal produces a right-side-up, non-reversed image with correct daytime orientation Fully coated prisms for superior image fidelity and maximum light throughput Accepts 1.25" eyepieces, fits in 1.25" focusers Not recommended for use in Newtonian reflector or Dobsonian reflector telescopes Requires 5/8" more focus travel than typical star diagonals