This 45-degree viewing angle image erecting diagonal has a knurled ring that threads onto the Cassegrain focus at the rear of Meade ETX-90/105/125 scopes only. It will not fit the Meade ETX-60/70AT scopes (use #933 instead on these models) or any other telescope. It increases the magnification of any 1.25" eyepiece used with it by approximately 8%. A chrome thumbscrew holds eyepieces firmly in place. It is fully coated for high light transmission. The #932 Prism is included as standard equipment with ETX Spotting Scopes.
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