Hmm, I can suggest a few different reasons for blurry images.
- Focus - check if the image is focus. Usually this can be done by turning the focusing knob/ring.
- Some sort of obstruction, residue, dirt, or damage of the optics. Check for condensation, dust, cracks, or misalignment.
- Shaky mount or any movement (including vibration) of the telescope during the long exposure in astrophotography scenarios. 
- Sky conditions may also be a factor.
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