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Many Dobs do not have enough back focus to allow the attachment of a DSLR.
If you have a Skywatcher/Saxon you are in luck because all their Newts/Dobs
do, and you don't need any adaptors other than the T-ring, just unscrew the 1.25" eyepiece holder, and the T-ring screws directly onto the male thread
that is then exposed.
raymo
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