While star diagonals correct a refractor's inverted image, they don't correct the left-right orientation. For terrestrial viewing, choose an erecting prism to achieve a natural view.
Note that due to the path length of this prism, it can't be used with Barlows or Powermate amplifiers. Not for use with Bino Vue due to weight limitations.
The 45° Erecting Prism works best at moderate magnifications. Note that erecting diagonals can only be used with refractors, SCTs, Maksutov-Cassegrains and similar telescopes. They cannot be used with Newtonian / Dobsonian reflectors and derivative designs.Manufacturer part number: AMI-0011