The fifth edition of New Perspectives on Newtonian Collimation is now available! Over 30 new illustrations and images, 16 chapters, 80 pages, 25,000 words. The first major rewrite in 10 years.

Place your order now!

Addendum to Perspectives

Have scope-will travel. Our 22-inch StarStructure telescope at the 2010 Chiefland Star Party.