This is a very simple refractor style telescope-- put the diagonal into the back of the telescope then put ONLY the eyepiece with the largest number written on it into the diagonal. Practice focusing during the day time -- on a distant object.
This is just like the scope Galileo used 400 years ago! Nothing to it-- but realize that it is ONLY 50mm in aperture the same size as a pair of 10x50mm binoculars.
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bought my tasco 420 second hand have no idea how it works, to me it looks out of allignment, if i take the lens out i see the edge of the mirror and the tube side and some light, i certinally get no image with the lens in, i have no instruction book and no idea what to do. please help
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