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Enables direct connection of a Mark I or II Hyperion Zoom eyepiece to a DSLR or CCD imager. M54 male threads under the eyepiece's eyecup step down to standard M42x0.75 T-mount threads to accept optional camera-specific T-rings. Using the M54 threads places the T-ring threads right at the eyepiece's lens for projection astrophotography techniques. If your imaging system requires more room, Baader's T-2 extension rings can be used as spacers. Dioptrix astigmatism correctors can also be integrated into your rig using this adapter.