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The Orion prime focus adaptor splits into two parts.
The chrome nosepiece - a 2" male to 2" x 24tpi (SCT) male thread.
The black portion is a 2" x 24tpi (SCT) female thread and a male T thread (42mm x 0.75)
I use it to mount SCT accessories on my ED80. The image shows a reducer fitted to the adaptor.
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