Hardbound, 6 by 9 inches, 200 pages (1 lb. 5 oz. ship. wt.)
$29.95
The Schupmann Telescope
The Story, Design, Construction and Use of a Neglected Telescope Type
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 the limits of the visual spectrum.
However, for over 106 years a refractor design has been available that is totally free of harmful color defects.
Employing but one glass type, this design, called a Schupmann medial after its inventor Ludwig Schupmann,
achieves amazing performance. It is this neglected telescope,
along with its close relative the brachymedial, that this book
describes in detail, along with an historical account, a discussion
of the Schupmann’s role in modern amateur research, system
principles and practical applications. Also included are design
prescriptions and construction information giving the advanced
telescope maker a new world to explore. Here for the first time
is a comprehensive discussion of
the design and fabrication of
these high resolution instruments.
Many successful medials are
shown in a photo gallery, giving
the builder a wealth
of further ideas.
ADDITIONAL LINKS:
- Table of Contents [ PDF ]
- Foreword [ PDF ]
- Perface [ PDF ]
- Introduction [ PDF ]