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Prisms, 90 degree diagonal mirrors, erecting eyepieces

Prism, 90 Degree Diagonal Mirror, Erecting Eyepiece

  1. Meade Zenith Prism Meade Zenith Prism £41.90
  2. Konus 2.8x erecting eyepiece for reflector telescopes Konus 2.8x erecting eyepiece for reflector telescopes £87.90
  3. 45° erecting prism 45° erecting prism £39.90
  4. Meade 5000 90 degree diagonal mirror Meade 5000 90 degree diagonal mirror £144.50
  5. Celestron 45 Degree Erect Image Diagonal 1.25" Celestron 45 Degree Erect Image Diagonal 1.25" £30.90
  6. Bresser erecting eyepiece 1.5x Bresser erecting eyepiece 1.5x £19.45
  7. Celestron 2-inch XLT Diagonal (SCT) Celestron 2-inch XLT Diagonal (SCT) £184.50
  8. Meade # 932 amici prism for Meade ETX 90/105/125 Meade # 932 amici prism for Meade ETX 90/105/125 £49.90
  9. Meade # 928 amici prism 45° 1.25 inches Meade # 928 amici prism 45° 1.25 inches £47.90
  10. Celestron Amici Prism 1,25" with 90 degree viewing Celestron Amici Prism 1,25" with 90 degree viewing £33.90

Amici Prisms, 90 degree diagonal mirrors & erecting eyepieces

Telescopes and eyepieces display a mirror image. This phenomenon is present in every telescope. As a result, left and right are reversed and the image is turned upside down. You can use a prism, a 90 degree erecting prism as well as an erecting eyepiece to restore the image to its original condition. This way, you will be able to observe more comfortably!

90 degree diagonal mirror

The 90 degree diagonal mirror is placed between the eyepiece and the eyepiece tube. This way, the light is bent 90 degrees, allowing easy viewing from the top. The image is upright, yet it is still mirrored. A 90 degree diagonal mirror is essential for Schmidt-Cassegrain & Maksutov Cassegrain telescopes.

Erecting eyepiece

Every telescope shows the image flipped upside down. Using an erecting prism also involves using an eyepiece. First the erecting prism is placed in the eyepiece, after which the eyepiece is shoved into the lens.

Amici prism

An Amici prism or roof prism is a normal rectangular equilateral prism where, instead of the biggest side, the two sides have been perpendicularly ground to each other. The prism actually consists of two combined triangular prisms. An Amici prism provides an upright image in an astronomical telescope. The prism cannot be used in combination with another optical instrument (90 degree diagonal mirror). Please bear in mind that using this prism does involve some loss of light.