1.25in. 45-deg Orion Correct-Image Prism Diagonal
- For terrestrial or astronomical use, this diagonal produces an right-side-up, nonreversed image
- Fully coated prisms for superior image fidelity
- Requires 5/8" more focus travel than typical star diagonals
- Accepts 1.25" eyepieces
For terrestrial viewing with a refractor or Cassegrain telescope, use of a correct-image (or image erecting) prism telescope diagonal may be desirable. The image through the eyepiece image will appear upright and non-reversed, matching the naked-eye orientation. So a correct-image telescope diagonal is essential for terrestrial viewing with the above telescope types and is useful for astronomical viewing for those that prefer to have the view through the telescope match the naked-eye orientation. This telescope diagonal is fully multi-coated and threaded for filters. Note that the 45-deg Orion Correct-Image Prism Diagonal requires 5/8" more focus travel than typical diagonals. Diagonals are not recommended for use in reflector telescopes.
