Using the eyepiece, and no camera lens, is a very different configuration to the camera+tube+scope (case 3). The configuration you're after is "Eyepiece projection".
I don't know exactly what you have available, but I believe you will need to fit a T-threaded extension tube to the external thread on your T-adapter. Then fit the camera onto that.
Note - before you go out and buy a new extension you can probably do a hand-held test of this by the following:
- Attach the adapter to the scope, with a low-power eyepiece in the adapter (low power makes the test easier to see.)
- Point the scope at anything distant (you can do this in daylight, but NOT at the sun of course!)
- Now hold the camera, by hand, a few inches behind the
eyepiece+adapter. Perhaps you can use a cardboard tube to keep the stray light out. - See if you can adjust the scope's focus, and the camera position, to get a sharp image.
If this worked, then you can get a T-threaded extension tube to go on the back of your current adapter, to hold the camera in position.
See for example this link:
http://www.astronomysource.com/2011/10/13/eyepiece-projection/
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