design and calibration of Schmidt Cassegrain telescopes
and focal reducers
REAL HELP FOR SCT OWNERS
The Design and Calibration of Schmidt Cassegrain
This document may be of interest to owners, or future
owners, of Schmidt Cassegrain Telescopes (SCT), especially
those who also have ccd or photographic attachments. Finding
no really useful in-depth book that covered the essential SCT
equations, optics, aberrations, and the complete laws for focal
reducers, I have spent some months compiling that reference. It
is now available at a small cost for production and
For details of how to get your copy, follow the Contents
below for the index of this 87 page document.
This document covers the practical aspects and measurements of
a Schmidt Cassegrain telescope (SCT) with sufficient design
backup to enable interested amateur astronomers to fully
understand their telescopes. It covers the concepts of the basic
optics, the design of the Schmidt plate, the effects of optical
aberrations, and the addition of focal reducers. It includes
the accurate measurement and calibration of your telescope.
It answers many of the awkward questions such as what is the
expected movement of the focus per turn of the focus knob, and
how does the focal ratio of the SCT change when one adds
extension pieces such as 2" diagonals, extenders and focal
reducers, ccds and cameras.
Lots of useful stuff for seriously interested amateur
astronomers. This document is not suitable for the Web but is
available in printed booklet form (87 pages and a cover for
Email me at <firstname.lastname@example.org> for further details about
receiving your copy.
Robert Deane (Retired Professional
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