Build a Home Made Telescope
These plans are for a homemade spotting telescopes.
The prismatatic telescope, is
an astronomical telescope
plus a pair of prisms for erecting
the image. The most common
example of this type of
construction is the binocular
instrument. One half of a binocular
is a monocular.
telescopes are used for a specific
purpose and are named
accordingly; a typical example being a spotting scope, which is used to view the
target in rifle shooting.
Prisms: Prisms are polished, angular pieces of glass,
the kind commonly used in telescopes being 45-45-90-
deg. prisms. The long side is the face, while the two
short sides are the reflecting surfaces. The size of the
prism is the width of the face. Fig. 44 shows how the
prisms are used in a telescope.
Made specifically for
telescopes, the prisms are grooved across the face in
order to make a definite dividing line and avoid ghost
images which would be caused by overlapping rays
at this point. The ends are usually rounded to conserve
How to Build a Binoculars and Spotting Scopess
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