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Hi Carlton,
You are correct about shortening the light path to the EP.
The refractor may be designed to focus EPs without a diagonal. That's why you might have less in-travel with the diagonal attached. The 30mm probably comes to focus because it is 2" and goes further inside the drawtube.
If your 1.25 inch adapter has a 1cm flange find one with a narrow flange (2mm) for the 20mm EP if it nearly focuses. Or you could use it without the diagonal. Not as comfortable though.
If your other EPs work fine there is certainly nothing wrong with the scope.
Regards, Rob
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