Collimating eyepiece - definition of Collimating eyepiece by The Free Dictionary
|an eyepiece with a diagonal reflector for illumination, used to determine the error of collimation in a transit instrument by observing the image of a cross wire reflected from mercury, and comparing its position in the field with that of the same wire seen directly.|
|See under Collimate.|
See also: Collimate, eyepiece
References in periodicals archive
Install the objective and use a sighting tube or a Cheshire collimating eyepiece
to align it as you would a standard, non-folded refractor.
After the telescope is assembled, I loosen the top clamp on each monopod and adjust the position of the secondary cage until the cross is centered in a collimating eyepiece
Even using collimating eyepieces
(S&T: March 1988, page 259), the task can be laborious.