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Newtonian Reflecting Telescope Designer
A Treatise on Newtonian Collimation (Text)
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Focal plane illumination
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PPT - In-Orbit vignetting calibration of the XMM-Newton telescopes PowerPoint Presentation - ID:4229119
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Skewed vignetting and Collimation Issues?!: Astrophotography Talk Forum Forum: Digital Photography Review
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Dale Keller's Newt Software page
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