Orion 1.25" Enhanced Mirror Star Telescope Diagonal | Orion Telescopes

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Orion 1.25" Enhanced Mirror Star Telescope Diagonal

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The precision flat mirror in this 90° diagonal is meticulously polished to yield excellent performance
Anodized aluminum housings are internally blackened for high contrast views free of glare
Fits 1.25" telescope focusers, accepts 1.25" eyepieces
Enhanced Aluminum mirror coatings yield 97% reflectivity for bright clear views
Includes dustcaps for storage

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Item # 08879

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Don't put a standard-issue diagonal into a high-quality refractor or Cassegrain telescope or you'll be losing 10% or more of the light collected by the telescope's optics. Use an Orion Enhanced diagonal instead. Their lab-tested enhanced aluminum coatings reflect 97% of the inbound light to your eyepiece, for brighter images compared to standard diagonals. Orion's beautifully machined and anodized aluminum housings feature machine-threaded baffles for high contrast and nonmarring compression ring collars for securing the eyepiece. The diagonal's nosepiece barrel is threaded to accept 1.25" filters. Endcaps included.

Diagonals are not suitable for use with Newtonian reflector telescopes due to insufficient focus travel.

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 800-676-1343.

Product Support

Visit our product support section for instruction manuals and more

Specs

Barrel size

1.25"
Coatings

Coatings

Lenses are coated with an antireflective material to ensure that as little light as possible is reflected away, so more gets to your eye. Good lenses are at least "fully coated," with a single layer of magnesium fluoride applied to each air-to-glass lens surface. Multiple layers of coatings are even more effective; the term "multi-coated" means one or more lens surfaces have multiple coatings. "Fully multi-coated" is even better, meaning that all lens surfaces are multiple-layer coated. Mirror star diagonals are coated with a reflective material similar to telescope mirrors in order to reflect the light into the eyepiece. Standard aluminum coatings reflect between 88%-92%, and enhanced aluminum reflects 97%. Dielectric coatings use a different process to deposit a coating that reflects 99% of the light. In addition to the higher reflectivity, Dielectric coatings are much more durable than aluminum coatings, so they last longer and can be cleaned with less risk of damage.

Enhanced aluminum
Optical quality

Optical quality

"Diffraction Limited" means that the limits of image detail are determined by the physical properties of light, and not by optical defects in the telescope.

Diffraction limited
Filter threads

Yes
Compression ring

Compression ring

Instead of a single thumb screw locking the eyepiece in place, a brass ring compressed by a thumb screw secures the eyepiece. This spreads clamping force over a larger area of the eyepiece's barrel, which provides a better connection. The compression ring also prevents the tip of the thumb screw from producing unsightly scratches and divots on the eyepiece barrel.

Yes
Weight (oz.)

7
Warranty

One year

Shipping Info

Orders received by noon Pacific Time for in-stock items ship the same business day. Orders received after noon will 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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1.25" Orion Dielectric Mirror Star Diagonal

The 1.25" dielectric mirror star diagonal angles the eyepiece to a comfortable position, while the dielectric coatings give you brighter images compared with a standard star diagonal. The harder surface from the coatings also makes cleaning easier.

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Orion Optics Cleaning Kit

This handy Orion Optics Cleaning Kit holds everything you need to keep your optics in top-rate condition. It includes optics cleaning fluid, 5 cotton swabs, lens tissues, optics cleaning cloth, and blower bulb.

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Since 1975 Orion Telescopes & Binoculars has been offering telescopes for sale direct to customers, with an unswerving commitment to best quality products, value and unmatched customer care. Our 100% satisfaction guarantee says it all.

Orion offers telescopes for every level: Beginner, Intermediate, Advanced, and Expert. From our entry level beginner telescopes for amateur astronomers to our Dobsonian telescopes to our most advanced Cassegrain telescopes and accessories, you can find the best telescope for you. And you'll enjoy discount prices by buying your telescope online, direct from Orion. Not sure how to choose a telescope? Orion's Telescope Buyer's Guide is a great place to start.

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