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In Australia, the flattener comes with the scope, but it's up to the country-specific distributor as to what's included.
The scopes include the necessary adaptors to give the correct spacing with a Canon DSLR. In the case of the 120 and 150, this is an extension tube that threads on to the rear of the flattener. On the inside of this extension tube there is a 2" filter thread. For the smaller scopes, it's possible to use a third party adaptor that provides similar capabilities (Baader make a M48 to Canon EOS adaptor that a low-profile 2" filter can be threaded into).
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