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Is it possible there are two versions of the Orion TOAG? Mine (bought from Bintel) has a raised annulus rather than the annular depression shown in the Bintel spec. Digital calipers give values of 10.5mm across the flats but 11.1mm when the raised annulus is included. so close! Does the T adaptor also add thickness?
My CCD cameras seem all to have backfocus between 12.5mm and 13.5mm so hopefully won't have the issue that interferes with the DSLR camera spacing. Touch wood!
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