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Message: <blockquote data-quote="Paul Corfield" data-source="post: 1241156" data-attributes="member: 19132">Been doing some more testing today. The 2" GSO 2X ED barlow works extremely well with the 1.5X teleconverter. I'll post some photos tomorrow. Also by using a couple of 60mm extension tubes I can get the magnification up to 4000mm and that's before the crop factor of 1.6X. Detail retention is excellent at long range which is mostly down to the barlow being very good at resolving fine details plus there isn't much glass being used to reach this magnification. Only 2 glass elements in the barlow and 4 in the teleconverter. The order I put the extension tubes in was one between the camera and the 1.5X teleconverter and the other one between the teleconverter and the barlow.Paul.</blockquote>