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Gotta agree with Joe too. Mine is a 70mm f7 achro with a 20mm 70º 1.25" eyepiece that gives amazing 2.5º views with an under 3mm exit pupil, just right for the city and darker sites. All fast refractors are going to have Field Curvature, the 70 f7 has a bit, but it is easy to ignore. Have seen that Myastro shop sell 80mm f5 refractor OTA's for about $159.
Well worth mounting it on your scope IMO.
Matt
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