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Thank you for that. Very interesting.
Measuring my celestron visual back with Pentax adaptor it is 60.3 and the same with a Meade Canon t adaptor attached. So I get a focal distance to face of adaptor of 105.76 with a Pentax which corresponds with closely with Astrotarp link but more than your text suggests. It would be troublesome to adjust without cobbling together a bunch of adaptors.
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