#928 45 degree Erect-Image Diagonal Prism
Each diagonal includes a Meade optical-flat mirror of Pyrex glass. Diagonal mirrors and prisms result in images that are correctly oriented up-and-down but reversed left-for-right. For terrestrial observing a fully correctly oriented telescopic image is desirable; the #928 Diagonal Prism accomplishes this image correction and places the eyepiece at a convenient 45 degree viewing angle. Use the #928 with the 1.25" Eyepiece-Holder.