You shouldn't need any barlow or lenses between the camera body and the telescope.
Normally you would use a 1.25" (or 2" depending on your focuser) with a T thread end. This then screws into a T2 thread adaptor on the camera body (effectively replacing the camera lens)
This arrangement should allow you to use the telescope (manually) as a great big telephoto lens!!!
Focusing the image using the focuser on the telescope.
Does that may any sense??
can you upload an image of your set-up??
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