Jaegers Catalog # 41D 1823. Amici prisms invert the image and bend the line of sight thru a 90 degree angle. They are excellent as prism diagonals in optical systems because they erect the inverted image. Can be used with your telescope as a diagonal that keeps correct left/right orientation. Sold for $35.00 in 1981 by A. Jaegers Optics.
