Diagonals

Star diagonals provide a more comfortable viewing angle when using refractors, Maksutov-Cassegrain, or Schmidt-Cassegrain telescopes. Upgrading the diagonal from 1.25-inch format is often beneficial as this will allow the use of 2-inch eyepieces. Owners of Schmidt-Cassegrain telescopes larger than eight inches in aperture should seriously consider upgrading to a 2-inch diagonal.

  • Celestron 1.25-inch Errect Image 45 Degree Diagonal
  • Celestron 1.25-inch Errect Image 45 Degree Diagonal

  • Celestron's 1.25 inch erect image diagonal allows you to look into the telescope at a 45 degree angle which ir more comfortable for terrestrial observations. read more...
  • Our price: $35.00

  • Celestron 1.25-inch Star Diagonal
  • Celestron 1.25-inch Star Diagonal

  • 94115-A Celestron Star Diagonal - 1-1/4" is standard equipment on many Celestron telescopes. read more...
  • Our price: $35.00

  • Celestron 2-inch SCT Diagonal XLT
  • Celestron 2-inch SCT Diagonal XLT

  • Upgrading to the Celestron 2-inch XLT Schmidt-Cassegrain Diagonal allows you to take advantage of the wider field of view provided by 2-inch eyepieces. read more...
  • Our price: $134.95

  • Meade Series 5000 2" Diagonal Mirror
  • Meade Series 5000 2" Diagonal Mirror

  • Meade Series 5000 2-inch Enhanced Mirror Diagonal with SCT and 1.25-inch eyepiece adapters. read more...
  • Our price: $149.00

  • Orion 1.25-inch 45-degree Correct Image Diagonal
  • Orion 1.25-inch 45-degree Correct Image Diagonal

  • For terrestrial or astronomical use, this diagonal produces a right-side-up, non-reversed image with correct daytime orientation read more...
  • Our price: $38.00

  • Orion 1.25-inch Correct-Image Star Telescope Diagonal
  • Orion 1.25-inch Correct-Image Star Telescope Diagonal

  • For terrestrial or astronomical use, this 1-1/4 inch 90-degree diagonal produces an upright non-reversed image. read more...
  • Our price: $39.00

  • Orion Dielectric Mirror Star Diagonal 1.25-inch
  • Orion Dielectric Mirror Star Diagonal 1.25-inch

  • 90-degree diagonal features sophisticated, lab-tested dielectric coatings that boast an astounding 99 percent reflectivity read more...
  • Our price: $89.00

  • Orion Dielectric Mirror Star Diagonal 2-inch
  • Orion Dielectric Mirror Star Diagonal 2-inch

  • 90-degree 2" mirror diagonal features sophisticated, lab-tested dielectric coatings that provide an astounding 99% reflectivity read more...
  • Our price: $139.00

  • Stellarvue 1.25-inch Erecting Prism
  • Stellarvue 1.25-inch Erecting Prism

  • This 45 degree erecting prism is useful for terrestrial observing, providing an erect image and a comfortable viewing angle. read more...
  • Our price: $69.00

  • Stellarvue Enhanced 2-inch Dielectric Diagonal
  • Stellarvue Enhanced 2-inch Dielectric Diagonal

  • The Stellarvue Deluxe 2 inch star diagonal features a 1/10 wave mirror and a 99% reflective dielectric coating that enhances contrast and performance. read more...
  • Our price: $189.00

  • TeleVue 45 Degree Erecting Prism 1.25"
  • TeleVue 45 Degree Erecting Prism 1.25"

  • While star diagonals correct a refractor's inverted image, they don't correct the left-right orientation. For terrestrial viewing, choose an erecting prism to achieve a natural view. read more...
  • Our price: $59.00

  • TeleVue 60 Degree Everbrite 1.25"
  • TeleVue 60 Degree Everbrite 1.25"

  • The TeleVue 60 Degree Everbrite diagonal is designed for comfortable terrestrial use and presents an image that is correct in the up-down perspective but left-right reversed. read more...
  • Our price: $239.00

  • TeleVue 90 Degree Enhanced Aluminim Diagonal 1.25"
  • TeleVue 90 Degree Enhanced Aluminim Diagonal 1.25"

  • TeleVue's basic 1-1/4 inch star diagonals feature a solid body construction for strength and rigidity of alignment and enhanced aluminum mirror coating with 96% reflectivity. read more...
  • Our price: $130.00

  • TeleVue 90 Degree Enhanced Aluminum Diagonal 2"
  • TeleVue 90 Degree Enhanced Aluminum Diagonal 2"

  • The 2 inch Enhanced Aluminum mirror coating provides a 96% reflective surface across all but the extreme ends of the visual spectrum. read more...
  • Our price: $219.00

  • TeleVue 90 Degree Everbrite Diagonal 1.25"
  • TeleVue 90 Degree Everbrite Diagonal 1.25"

  • TeleVue Everbrite diagonals feature advanced broadband di-electric coatings and solid body construction providing both greater durability and 99% reflectivity. read more...
  • Our price: $185.00

  • TeleVue 90 Degree Everbrite Diagonal 2"
  • TeleVue 90 Degree Everbrite Diagonal 2"

  • TeleVue 2-inch Everbrite star diagonal with 99% reflective di-electric coating features solid body construction for strength and rigidity of alignment. read more...
  • Our price: $285.00

  • TeleVue Long SCT Adapter
  • TeleVue Long SCT Adapter

  • This adapter is used to attach a 2" TeleVue diagonal to a Schmidt-Cassegrain telescope. read more...
  • Our price: $48.00

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