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Please Note

Orion has made the difficult decision to close our warehouse facility in the Netherlands. With the continuing supply chain/logistics challenges and slowness in the economy we have found that it is not economically feasible to maintain operations in the UK and Europe.

We have therefore stopped taking orders on this website. We apologize for any inconvenience.

We will continue to have Orion dealers in Europe to meet the needs of Orion consumers. We will also continue to honor the 30-Day product return period as well as honoring the Orion warranty for purchases made in the UK and Europe.

Our US-based Customer Service Representatives are here to help. Contact them via email at support@telescope.com or in the United Kingdom, via phone at 0-800-041-8146 (Monday-Friday between the hours of 1300 and 2400 GMT).

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Orion Telescopes
Intermediate
1.25" Orion Dielectric Mirror Star Diagonal
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This product is no longer available for purchase.
  • 90-degree diagonal features sophisticated, lab-tested dielectric coatings that boast an astounding 99 percent reflectivity
  • Dielectric mirror coatings are more durable and more reflective than enhanced aluminum coatings
  • Diagonal provides a comfortable 90-degree viewing orientation when observing the night sky through a refractor, Maksutov-Cassegrain (Mak-Cass) or Schmidt-Cassegrain telescope
  • Machined and anodized aluminum housing features machine-threaded baffles for optimized contrast
  • 1.25" nosepiece barrel is threaded to accept like-sized Orion eyepiece filters


Learn more
Item #  08880u

The Orion 1.25" Dielectric Mirror Star Diagonal is an ideal choice for refractor and Cassegrain telescope users who wish to obtain the brightest views possible of the many wonders of the night sky. This high-quality mirror diagonal features sophisticated, lab-tested dielectric coatings that boast an astounding 99% reflectivity. With such high reflectivity, your views of starry skies will be bright, detailed, and full of contrast. Dielectric mirror coatings are more durable than enhanced aluminum coatings, so you'll enjoy years of exceptional performance without degradation.

The machined and anodized aluminum diagonal housing features machine-threaded internal baffles to ensure high-contrast performance and eliminate pesky internal reflections and glare. A non-marring compression ring collar is built-in to safely secure any inserted 1.25" telescope eyepiece without scratches. The diagonal's 1.25" nosepiece barrel is conveniently threaded to accept like-sized filters so you can swap between different telescope eyepieces easily without having to detach and re-attach the filter onto each eyepiece you use. Protective caps are included to keep the diagonal free of dust when not in use.

This diagonal requires approximately 9cm inward focus travel relative to an eyepiece's focus position without the diagonal. Diagonals are not recommended for use with Newtonian reflector telescopes.

Warranty

Limited Warranty against defects in materials or workmanship for one year from date of purchase. This warranty is for the benefit of the original retail purchaser only. For complete warranty details contact us at sales-eu@telescope.com

Product Support
Visit our product support section for instruction manuals and more
  • User level
    Intermediate
  • Barrel size
    1.25"
  • Coatings
    Dielectric
  • Optical quality
    Diffraction limited
  • Filter threads
    Yes
  • Compression ring
    Yes
  • Weight (g)
    191g
  • Warranty
    One year

Orders received by 5pm UTC for in-stock items ship the next business day. When an item is not in-stock we will ship it as soon as it becomes available. Typically in-stock items will ship first and backordered items will follow as soon as they are available. You have the option in check out to request that your order ship complete, if you'd prefer.

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