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Dovetail dimensions for 2.5" feather touch focusers

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Hi all,


Does anyone know the diameter of the dovetail part of the 2.5in (FTF2535HD and similar) feathertouch focuser adapters? I refer to the diameter of the opening with the PTFE coated inside with clamping screws.

A typical example is adapter A25-2003-1.




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