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Diagonals and Prisms

ScopeTronix Economy 1.25" Mirror Diagonal

   Mirror diagonals are well known for superior performance over prism diagonals, but they are typically a high cost item. These mirror diagonals use a top quality first surface mirror, yet house it in a inexpensive plastic case to keep costs way down! Only the central triangular "box" is plastic, the ends are metal. Includes dust cap.

ScopeTronix 45º Erect Image Diagonal

   We have just added a new item to our ST Series of optics, the 1.25" 45 Degree Erect Image Diagonal. The ST Series is well known for high quality at an attractive price and this diagonal continues that tradition. These diagonals offer a comfortable 45 degree viewing angle and present an upright and correct image. They are primarily intended for viewing terrestrial objects such as for nature viewing, but can be used for astronomical objects as well to help you sort out a star map without reversed or mirrored images! Includes dust cap.

#929 (rear) and #928 (front)

Meade #928 1.25" 45° Erecting Prism

   The #928 45° Erecting Diagonal Prism gives a fully corrected image and is ideal for terrestrial viewing, the image is right side up and left/right corrected for a totally natural view through your spotter or telescope. The 45° viewing angle is also very comfortable for terrestrial viewing.

Meade #932 45° Erecting Prism

   All model ETX's include an internal optical-flat mirror to reflect light to the telescope's rear port, in this position the telescope’s image is upright, but reversed. For terrestrial observing with the ETX-90EC/RA & 125EC telescopes the #932 Prism results in a fully correctly oriented image and a convenient 45° observing angle. Note that the #932 Prism is included as standard equipment with the ETX Spotting Scope.

Meade #933 ETX60/70 45° Erecting Prism

   Typical of most astronomical telescopes, images through the ETX-60AT and ETX-70AT appear right-side-up but reversed left-for-right. For astronomical viewing this orientation is of no consequence. However, for terrestrial observing, where a fully correctly oriented image is desirable, the #933 45° Erecting Prism threads on to the telescope's rear cell and accepts an eyepiece of any focal length.

Meade Series 5000 2" Enhanced Diagonal

2" enhanced dielectric coated diagonal mirror with 99% reflectivity. Includes 1.25" eyepiece adapter.

#929 (rear) and #928 (front)

Meade #929 SCT 2" Diagonal Mirror

   The #929 2" Diagonal Mirror attaches to the rear cell of all Meade LX-series telescopes and permits the use of wide-field 2" O.D. eyepieces (e.g., Meade Series 4000 Super Wide 32mm and 40mm eyepieces and others). Each diagonal includes a Meade optical-flat mirror of Pyrex glass, aluminized and multi-coated. Note that diagonal mirrors and prisms result in images that are correctly oriented up-and-down but reversed left-for-right. Includes a 2" to 1.25" eyepiece adapter. Includes UHTC Coatings.

Meade #930 2" Diagonal

Meade 2" diagonal for refractors and LX200GPS (2" barrel input), UHTC coatings, 1.25" adapter included.

Celestron 0.965" to 1.25" Erect Image Prism

   Celestron's Erect Image Diagonals are an Amici prism design. This design allows you to look into the telescope at a 45° angle, at images that are oriented properly, meaning the image is upright and correct from left to right. Use of Celestron's 0.965" to 1.25" 45° Erect Image Diagonal on a telescope equipped with 0.965" eyepieces means greater versatility. This diagonal will allow you to use 1.25" eyepieces, to obtain a larger field of view and better eye relief.

ScopeTronix 2" to 1.25" Adapter

   This adapter allows you to use 1.25" eyepieces in 2" eyepiece ports. Now includes a compression ring to help avoid marring up your expensive eyepieces.