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Message: <blockquote data-quote="Hermann" data-source="post: 3166209" data-attributes="member: 4925">Is that the MTO 10/1000 telephoto lens? I've got one of those as well, with a later serial number (922xxx). I use it with an Intes prism diagonal and Zeiss Jena orthoscopics (26mm, 16mm and 10mm). At 100x the image is very good indeed. Used with a Leica zoom eyepiece (plus adapter) I get up to 140x, still at a very decent optical quality.The MTOs are really nice and built to last. There were quite a lot on the market some 20 years or so ago, and many astronomers over here got them for use as a travel scope. They were lovingly called "Russentonne".Hermann</blockquote>