If you use simple lenses, (which are grinded from only one piece of glass) as objectiv lens (for example the home magnifiers), the result will always be this poor optical quality. But the complex achromates (made of min. 2 parts, different glass materials, with sophistically designed curves and other tricks) may be too expensive for an amateur astronomer, so here are the tricks to improve a bit the imaging of these simple and cheap lenses.
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