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The good I confess I am disappointed, until now all Plossl eyepieces seben had an unbeatable value for money but the quality is not at the appointment over other eye (20mm, 10mm) While it is clear there but we also see that the quality is not the same in relation to other eyepieces seben, so I can not be their chance and I came across a bad series but with 4mm I do not see the division of Cassini Saturn on while seben with Barlow and 10mm still seben I see very well. Finally however I may be too pushes my gear which degrades the image quality and not from the eye, but I still doubt.