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Edge of
secondary mirror
Primary
mirror spot
Primary mirror clip
Reflection of secondary
holder with four spider vanes
Figure 3A. The view down the focuser tube of a Newtonian reflector with eyepiece removed. In this
example, the optical system is badly out of collimation.
Annulus (Reflection
Bottom edge of
of 45 polished flat)
Collimating Eyepiece
Crosshairs of
Collimating Eyepiece
Figure 3B. Secondary mirror centered
under focuser tube, viewed through the
Collimating Eyepiece (as are the next
two illustrations).
Reflection of
your eye
Reflection of
primary mirror
Secondary mirror holder
Reflection of
Collimating
Eyepiece
crosshairs
Figure 3C. Secondary mirror correctly
aligned (tilted).
Bottom end
of focuser tube
Figure 3D. Primary mirror correctly
aligned. The telescope's optical system
is now collimated.
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