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If you enjoyed that, Rob, you'd probably like the chapter on eyepieces in the book "Telescopes, Eyepieces and Astrographs" by Smith, Ceragioli and Berry. The spot diagrams demonstrate the performance of each eyepiece design very clearly. I found it very interesting to see the steady and significant improvements made as eyepieces evolved over time
The rest of the book is very good too...
Cheers,
Rick.
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