Simply add our Our 1.25" 45 Deg. Diagonal Erect Image Prism prism to convert a telescope into a spotting scope for birders, naturalists, whale watchers and target shooters. The 90 Deg. Diagonal provided with most astronomical telescopes is designed for viewing of celestial objects, but it flips the view in the eyepiece to give a mirror image. To see terrestrial (or Celestial) objects with normal left-right orientation, it is necessary to use the 45° Diagonal Erect-Image Prism. Our 45 Deg Diagonal erect image prism will work with any standard 1.25" eyepieces and will turn upside down images right side-up and give correct left-to-right view. This 45 Deg Diagonal erect image prism is included with our LOMO Astele spotting scopes, and it will allow to convert your telescope into a spotting scope!

1.25" 45 Deg. Diagonal Erect Image Prism Rating & Reviews