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Erik,
The 27TVPH has A-P 2.7" threads on both sides and screws into the focuser. The CCDT67 slides into a 2" adapter so that's probably what you're thinking of. Both reducers give a variable reduction ratio depending on distance from the sensor (image circle varies with distance too). The link I gave specifies the calculations for both reducers.
Cheers,
Rick.
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