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This is a generic 1.25" 45-degree correct image diagonal. It is in excellent condition, with absolutely clean optics and an unmarred body. It comes with only one dust cap and no box.
- 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
For terrestrial viewing with a refractor or Maksutov-Cassegrain telescope, use of a correct-image (or image erecting) prism telescope diagonal may be desirable. The image through the eyepiece will appear upright and non-reversed, as you'd see it with your eyes. The diagonal is also 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 for maximum light transmission and is threaded for use with 1.25" eyepiece filters.
Note that the 45° Correct-Image Prism Diagonal requires 5/8" more focus travel than typical diagonals.
Diagonals are not suitable for use with Newtonian reflector telescopes due to insufficient focus travel.