Margo,
the picture helps.
If you are using the Pentax, and the dob (no eyepiece) then I venture to suggest you are too far from the focus point, sorry clever cousin.
If you are using an eyepiece try focusing it by eye, and without the camera in place, if possible. Then attach the camera behind the eyepiece, and it should be close to focus, with afew tweaks needed to make it better/perfect.
Gary
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