Hi Leo, as no one else has replied, if you are trying to image through the telescope with an DSLR then you need at least 50/60mm of drawtube in travel from where your eyepieces generally reach focus for the camera sensor to reach the focal plane. Do you use a diagonal for visual, if so , when trying to use the camera don't use with the diagonal, then you should be able to reach focus easily by extending the drawtube .
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