• DayStar 2-Inch Dielectric Mirror Diagonal — High-Reflectivity 90° Star Diagonal for Refractors and Cassegrains
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Daystar

DayStar 2-Inch Dielectric Mirror Diagonal — High-Reflectivity 90° Star Diagonal for Refractors and Cassegrains

DayStar 2-Inch Dielectric Mirror Diagonal — High-Reflectivity 90° Star Diagonal for Refractors and Cassegrains

$159.00
$159.00
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Shipping calculated at checkout.

The DayStar DS2MD is a premium 2-inch dielectric mirror diagonal — the angled piece that redirects the light path 90° so you can look into the eyepiece comfortably instead of craning under the telescope. Its dielectric-coated mirror reflects about 99% of incoming light, noticeably more than standard enhanced-aluminum (~88%) or silver (~96–97%) coatings, for brighter, higher-contrast views without changing your optics.

Who it's for
Refractor or Cassegrain (SCT/Mak) owners upgrading from a prism or aluminum diagonal who want brighter, sharper views. New to accessories? See our guide to the accessories every beginner needs.

  • 99% dielectric mirror: reflects more light than aluminum or silver coatings for brighter, higher-contrast views.
  • 2-inch and 1.25-inch: accepts 2" eyepieces; includes a 2"–1.25" step-down adapter.
  • Brass compression rings: grip eyepiece barrels securely without scratching.
  • Filter-threaded: barrel and adapter take standard 2" filters.
  • For refractors & Cassegrains: works with refractors, SCTs, and Maksutovs — not Newtonian or Dobsonian reflectors.
Specifications
Barrel Size 2" (50.8mm)
Reflection Angle 90°
Mirror Coating Dielectric, ~99% reflectivity
Eyepiece Holder Brass compression ring (non-marring)
Filter Thread 2" standard
Compatible Telescopes Refractors, SCTs, Maksutovs (not Newtonian / Dobsonian)
Model / SKU DS2MD
What's in the Box 2" dielectric mirror diagonal, 2"–1.25" step-down adapter with compression ring

Will it fit my telescope?
It suits refractors and Cassegrain-type scopes (SCT, Maksutov) with a 2" focuser or visual back. It is not used on Newtonian or Dobsonian reflectors.

Can I use 1.25-inch eyepieces?
Yes — the included 2"–1.25" step-down adapter accepts 1.25" eyepieces.

Why choose dielectric over a standard mirror?
Dielectric coatings reflect about 99% of light versus ~88% for enhanced aluminum, giving brighter, higher-contrast views with no change to your telescope.

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Frequently Asked Questions

With a beginner telescope you can see a surprising amount — the craters and mountains on the Moon, the rings of Saturn, the moons of Jupiter, and star clusters like the Pleiades. As you get more comfortable, you can also spot nebulae and distant galaxies. Not sure which beginner telescope is right for you? Check out our Telescope Buying Guide.
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All telescopes on Telescope Wolves are hand-picked with beginners in mind. If you're unsure which telescope is right for you, check out our Telescope Buying Guide.
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