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500 deep-sky objects color-coded by type
major spreading centers and convergence zones are associated with plate tectonism
and NGC 5728
Volume 9 also includes two special fold-out maps for exploring the Magellanic Clouds in more detail
maps provide maximum clarity and are optimized for use with red light—ideal for nighttime observation
Schupmann Telescope CDs & DVDs 500 deep-sky objects color-coded byBy James Daley. Product Information: Hardbound, 6 by 9 inches, 200 pages. Perfecting the refracting telescope has frustrated lens designers and glass makers since the invention of the telescope. This is because when using standard crown and flint glasses, residual longitudinal color (its dominant defect) cannot be reduced to an optically harmless value. Even today, the most expensive special glass apochromats show some noticeable color, especially at
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