Dome & 10-inch Calver sold by eBayUK auction May 4th 2008

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400th Anniversary of the refractor
Constructing a replica of "Old Discoverer"
250th Anniversary of the Achromatic refractor
Appleworks spreadsheet time line of the invention of the achromatic lens
Comparison Test Three Plossl Eyepiece Types, Brandon, TeleVue, GSO Revelation
[1.9Mb pdf]




Need for star colour magnitude threshold observations
Eyepiece articles
Eyepiece Evolution Tree Diagram
H-alpha Solar Filters
Quantum 6 -Maksutov-Cassegrain sold

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