7
Optical tube is a telescope itself.
All the main optical assemblies are
mounted into it: objective lens with
corrector, eyepiece assembly with
focusing mechanism and optical
finder.
According to the type of optical
scheme the telescope refers to the
apochromatic refractors. There is
used an original optical scheme, not
containing special sorts of glass, in
the telescope. Parallel beam of light
gets into the telescope tube and with
the help of objective lens () and
corrector () is projected at the focal
plane of an eyepiece (4).
For observation convenience, the
eyepiece assembly is inclined
relatively to the telescope axis by
90º with the help of flat diagonal
mirror (3).
There is a finder integrated in the
optical tube, and facilitating the
search of objects in the sky.
All surfaces of lenses are coated with
multi-layer clearing coverings.
The eyepiece assembly includes
focusing mechanism with eyepiece
tube.
Focusing mechanism of frictional
type includes an axis with
handwheels (), with help of which
the eyepiece tube shifts.
Motion smoothness of the eyepiece
tube is regulated with the help of a
screw ().
Screw (3) provides fixation of the
eyepiece tube in adjusted position.
Design of telescope