Schupmann Telescope CDs & DVDs 26 sky charts showing the

26 sky charts showing the locations of the Arp galaxies by region (see sample)

the Duplex Moon Atlas is the ultimate tool for telescopic observers of the Moon‘s surface

and NGC 5728

deep-sky objects

Publication Date: December 2014

Schupmann Telescope CDs & DVDs 26 sky charts showing theBy 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