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a good story
plus a set of seasonal finder charts
Featured objects in Hydrus include NGC 602
along with an historical account
Interferometry for Amateur Telescope Makers Willmann-Bell a good storyInterferometry for Amateur Telescope Makers, A practical guide to building verifying and using an optical interferometer including powerful software to evalute interferograms By William Zmek. Product Information: 6 by 9 inches, hardbound, 500 pages, 38 photographs, 195 drawings. CD is included. This book has been written for the Amateur Telescope Maker (ATM) one who grinds, polishes, figures and tests optical surfaces with the objective of achieving
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