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Ah, see your problem. In my case I was using the scope, with a 2" nose-piece, so screw on. Also used the Ha with a camera lens, but on the QHY8, and this time via an adaptor that was "hollow" enough to allow me to fit the Ha inside.
If you are using the Canon lenses straight on the EOS body, then yes the clip in sucker is likely the only way.
Mine is the Baader 7Nm and it is about right, if faced with the 13 Vs 6 dilemma I guess I would plum for the 6.
Gary
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