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Hi Stu,
If you have the collapsible dob, dont fully extend by around 1" to 2" and binos will come to focus. ( This is the case with Williams Optics with the 1.6x supplied with corrector.) If your OTA is non extendable then primary and secondary mirrors must be brought closer together by 1" to 2"to achieve focus with supplied corrector, otherwise an extention tube (or two ) have to be screwed in between bino end and corrector. This last option has the downside of further increasing magnification and diminishing the size of field of view. In my own case with my 14" f5 dob I moved focusser and spider/secondary assembly 1.5-1.75" down tube thus reducing distance between mirrors and giving myself the extra lightpath length at focusser necessary for focus to be obtained.
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