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I have one Ramsden or Kellner 20mm from Zeiss 4" terrestrial refractor.. and I still use it from time to time if you believe me..
Another one is 40mm (cartridge only, 45mm dia.. ) I plan to make the rest for 2" one day.
Both came from the same telescope (on the pic attached), they are surprisingly good, excellent eye relief.. and were part of the turret (the third 10mm one was broken)
Last edited by bojan; 25-09-2013 at 08:27 PM.
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