collimation   39

Telescope Reviews: AD12 Secondary shift and XLKP
The high magnification tolerance for the primary mirror axial alignment is +/-0.005mm times the focal ratio cubed.

The high magnification tolerance for the focuser axial alignment is +/-0.03 times the aperture diameter (unless a coma corrector is being used, then it's +/-0.005 times the aperture diameter).
astro  collimation 
january 2014 by steveofar
Cheshire eyepiece
A Cheshire eyepiece or Cheshire collimator is a simple tool that helps aligning the optical axes of the mirrors or lenses of a telescope, a process called collimation. It consists of a peephole to be inserted into the focuser in place of the eyepiece. Through a lateral opening, ambient light falls on the brightly painted oblique back of the peephole. Images of this bright surface are reflected by the mirrors or lenses of the telescope and can thus be seen by a person peering through the hole. A Cheshire eyepiece contains no lenses or other polished optical surfaces.
astronomy  telescope  collimation 
october 2012 by immortaljellyfish
Collimating my "Dob"
best article about collimating a Newtonian reflector.
april 2011 by jcwhitt

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