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3.3 focal reducer
I see no-one has responded to your queery as yet. I'm not expert on the topic, but your assumption is correct pretty much.
The reducer screws straight onto the back of the scope. There are spacers that make up part of the T thread system, and you have to use what you need to achieve focus. There is an ideal distance (not sure what it is) that should be in the enclosed literature.
The 3.3 cannot be used for visual observing, and vignetting is severe. It is probably best for use with smaller ccds such as DSI or LPI. I think vignetting is too severe for a DSLR.
HTH
BAC
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