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 Celestro... [more]

Meade #932 45º Erecting Prism for ETX90, 105, & 125       * 45º erecting prism for all 90-125 ETX models.       * Allows for a left-to-right correct and upright image through the telescope... [more]

    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, w... [more]

45 degree prism for refractors gives normal image oriewntation. Terrestrial use only.

    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... [more]

We have just added a new item to our ST Series of optics, the 1.25" 90 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 90 degree viewin... [more]

Stellarvue new 45° EP will work with any 1.25" eyepieces and scopes with 1.25" eyepiece holders. It will turn upside down images right side-up and give correct left-to-right image. This high-quality, low-cost erecting prism will set the standard i... [more]

2" Correct-Image Prism Diagonal       * Diagonal provides a correctly oriented view for stunning daytime views     * Also handles your 2" eyepieces for serious nighttime observing     * Acce... [more]

Full 2 inch aperture fitted with brass compression ring. Sharpest and brightest 2 inch erecting prism on the market. This new 45° EP will work with any 2 inch or 1.25" eyepieces and scopes with 2" eyepiece holders. Supplied with 1.25 inch adapter t... [more]