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I had a bad experience with Meade plossl (20mm, sold on Ebay for US$25.00). The field of view was wide enough, but when the image was sharp in centre , it was out of focus at the edges...(even my old Zeiss Huygens was better). I thought that something is wrong with that particular one so I asked the vendor for another one, but no joy, so I had to send both of them back).
Other Meade Plossls were reasonably OK (10mm and 5mm. Coated barlow was OK as well)
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