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Lumicon 1.25" Male - 2" Female Adapter
GSO 2" to 1.25" Zero-Profile Eyepiece Adapter # FF021
Celestron 2" to 1.25" Adapter with Twist-Lock 93668 B&H Photo
1.25 Inch To 2 Inch Eyepiece Adapter Telescope Astronomy 31.7mm To 50.8mm Metal Adapter For Binoculars Monocular 1.25" To 2" - AliExpress