File:Fabra Observatory Refractor.jpg

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English: Double Refractor at the Fabra Observatory, Barcelona. The visual instrument (the lower of the two tubes) has an aperture of 38 cm and a focal length of 6 meters (f/15.8). The photographic instrument also has an aperture of 38 cm, but a shorter focal length of 4 meters (f/10.5). The Instrument was built by Mailhat, Paris, in 1904.
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Author H. Raab (User:Vesta)

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current11:23, 14 September 2017Thumbnail for version as of 11:23, 14 September 20171,365 × 2,048 (2.02 MB)Vesta (talk | contribs)User created page with UploadWizard

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