• Explore Scientific 2" 99% Reflective Dielectric Diagonal
  • Explore Scientific 2" 99% Reflective Dielectric Diagonal
  • Explore Scientific 2" 99% Reflective Dielectric Diagonal
  • Explore Scientific 2" 99% Reflective Dielectric Diagonal
  • Explore Scientific 2" 99% Reflective Dielectric Diagonal
  • Explore Scientific 2" 99% Reflective Dielectric Diagonal
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Explore Scientific

Explore Scientific 2-Inch Dielectric Mirror Diagonal — High-Reflectivity 90° Star Diagonal with 1.25-Inch Adapter Included

Explore Scientific 2-Inch Dielectric Mirror Diagonal — High-Reflectivity 90° Star Diagonal with 1.25-Inch Adapter Included

$219.99
$219.99
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The Explore Scientific 2-Inch Dielectric Mirror Diagonal is a high-reflectivity 90° star diagonal that gives comfortable, upright viewing angles on refractor and catadioptric telescopes. Its 99% dielectric-coated mirror transmits maximum light with true color, delivering brighter, higher-contrast views than standard aluminized diagonals — and a 1.25" adapter is included so you can use both 2" and 1.25" eyepieces.

Who it's for

Owners of refractors, SCTs, and Maksutov telescopes who want a premium diagonal for the brightest, most color-accurate views. New to accessories? See our guide to the telescope accessories every beginner needs.

Key features

  • 99% dielectric-coated mirror for maximum brightness and true color
  • 90° star diagonal for comfortable viewing when pointing high
  • 2" body with included 1.25" adapter — works with both eyepiece sizes
  • Fits most refractors and catadioptric (SCT/Mak) telescopes

Specifications

Type 90° dielectric star diagonal
Mirror coating 99% dielectric
Barrel 2" with 1.25" adapter included
SKU DD02-00CF

Frequently asked questions

What does a dielectric mirror do?
A dielectric coating reflects about 99% of the light with no color shift, giving noticeably brighter, more color-accurate views than a standard aluminum-coated diagonal.

Will it fit my telescope?
It's designed for refractors and catadioptric (SCT/Maksutov) telescopes that accept a 2" diagonal. The included adapter lets you use 1.25" eyepieces too.

Does it work with a Newtonian reflector?
No — Newtonian reflectors don't use a star diagonal. This is for refractors and catadioptric scopes.

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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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