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I have a 5mm Vixen Lanthanum and a 7.5mm Orion Lanthanum (both purchased used), as well as a 6mm Celestron Orthoscopic of early 1990's vintage. The orthoscopic has only about 40 degrees apparent field of view, and rather short eye relief. Since I have astigmatism and must wear glasses at the telescope, the long 20mm eye relief of the Lanthanums seemed to fulfill my wish for a comfortable high-power eyepiece.