Celestron Telescopes Erect Image 1-1/4" Diagonals Items Diagonal Star - 90 degree 1-1/4''. This design allows you to look into the your Celestron 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 .96" to 1-1/4" 45 Erect Image Diagonal on a telescope equipped with .96" eyepieces means greater versatility. This Diagonal will allow you to use 1-1/4" eyepieces to obtain a larger field of view and better eye relief. A 90 1.25" Erect Image Diagonal is available for those who prefer that angle. 1 - 1/4" Star Diagonal lets you view objects that are at a 90 angle from the direction the telescope is pointing thereby allowing comfortable viewing when the telescope is pointed at or near the zenith (i.e. directly overhead). The resulting image is right side up but will be reversed from left to right. Specifications for Celestron Telescopes Erect Image 1-1/4" Diagonals: Manufacturer: Celestron Condition: New Features of Celestron Telescopes Erect Image 1 - 1/4 " Diagonals: Allows you to look into your Telescope at a 45 or 90 angle Image is upright and correct from left to right Package Contents: Celestron Telescopes Erect Image 1-1/4" Diagonal