I bought Stu's lxd75 6" f/5 newt, which he got only because could not buy the mount on its own. It has a spherical mirror and appalling performance. Feedback from 6" lxd75 newt owners in the States suggests that some of these 6" f/5 meades are good and have a parabolic mirror. Mine is a shocker with textbook spherical aberration star test.
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