My SX AO-LF was in my camp fridge for the past two weeks (attached to the main camera to shoot darks), but the run finished today and so I was able to double check the measurements.
The clear aperture is indeed 60 mm, but it's substantially reduced by the standard adapter plates and adapters that shipped with my unit: T-thread and STL on the camera scope, and T-thread and SCT on the scope side. Apologies for any confusion, Greg.
To get the full 60 mm aperture, you'll need to find M72 threaded adapters for both sides of the AO-LF unit.
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