I just bought the Meade 289 m telescope with all eye pieces: 25mm, 12.5mm and 4mm. No matter how i try to focus it will not focus on a targeted subject. I aimed it at the moon, an easy subject but to no avail. If i remove the eyepiece and look into the refractor I can see the subject but once I replace the eyepiece it becomes out of focus again. Please advise me.

Optics - Meade - Polaris 285 (225 x 60mm) Telescope