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I'm not mad on the f5 refractors way too much every aberration you can name. I ditched my 102 f5 for a 70mm f7 achro with a 20mm 70 degree eyepiece. I get around 2.5 degree of sky which frames lots of clusters etc very nicely and the 20mm eyepiece gives a nice dark background. I could use a 30mm plossl for a wider view but then the view gets washed out in the city. Naturally there is CA but not much field curvature. Dirt cheap too.
Matt
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