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Message: <blockquote data-quote="jring" data-source="post: 3336278" data-attributes="member: 133897">Hi,thanks for the pictures - your Optolyth is indeed an older version with the embossed type - later are printed. There is also an HD version of this which looks the same except for a red line saying HD Fluorite Lens on the tripod adapter ring. See this ebay offer for pictures (also with the 22-60 zoom).<a href="http://www.ebay.de/itm/Optolyth-TBS-80-HD-F-22-60x-OVP-Mit-Tasche-Spektiv-Fernrohr/221867157830" target="_blank">http://www.ebay.de/itm/Optolyth-TBS-80-HD-F-22-60x-OVP-Mit-Tasche-Spektiv-Fernrohr/221867157830</a>I could not id the opticron ED - and it looks like opticron. If it was not expensive you might try if you can remove the funnel like plastic thingy below the thread. Check if the moving front element (you can see it mooving back and forth when zooming) does not loose its seating when doing so.Or order an SDLv2 from amazon in spring when the weather is ok, try it and if it's not good - send back.Should I get sent to London on business this year (it has happened before) I'll give you a shout and bring mine if you still have the Optolyth.Joachim</blockquote>