File:OpticalTube3.png

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Description
English: Optical tube of Cassegrain telescope
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Source Own work
Author Mungany

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Public domain I, the copyright holder of this work, release this work into the public domain. This applies worldwide.
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current19:41, 20 March 2009Thumbnail for version as of 19:41, 20 March 2009960 × 720 (23 KB)Mungany~commonswiki (talk | contribs){{Information |Description={{en|1=Optical tube of Newton Cassegrain telescope}} |Source=Opera creata e caricata dall'autore (own work by uploader) |Author=Mungany |Date=20 marzo 2009 |Permission= |other_versions= }} <!--{{ImageUpload|ful

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