Orion 1.25" Dielectric Star Diagonal

Orion 1.25" Dielectric Star Diagonal

Due to high demand and global product shortages due to the pandemic, please call for availability.

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