Orion 1.25" Dielectric Star Diagonal

Orion 1.25" Dielectric Star Diagonal


Improve the quality of your refractor or Cassegrain scope with an Orion 1.25" Dielectric star diagonal.

The mirror uses a stack of dielectric (non-conductive) interference coatings on glass substrate, which results in a 99% reflectance of the light across the broad visible spectrum. These coatings are more durable than Aluminum and Silver coatings.

Like all well-engineered products, this diagonal is precision machined out of Aluminum to deliver excellent optical alignment. Internal threaded baffles and black anodized to provide maximum contrast. Brass compression fittings with a knurled thumbscrew will not mark your eyepiece barrels.


  • Dielectric coated mirror for higher reflectance
  • Brass compression fitting for a secure, non-marring connection
  • All-metal construction


  • Mirror: Dielectrically coated, 99% reflectance
  • 1.25" interface
  • Standard 1.25" Filter thread on 1.25" barrel
  • Optical Length: ~10cmcm (4.7") (when fully inserted into telescope)
  • Width: 42mm (1.6")
  • Weight: 196g (6.9oz)
  • Color: Black
  • Made in Taiwan
  • One year warranty