Assertion: eyepiece | /r/AtLocation | the telescope
Facets:
Source sentences:
text: The true field (or real field) of view is the area of sky seen through the eyepiece when it's attached to the telescope.
text: When attached to a telescope, the eyepiece does not project a conjugate image point.
text: An eyepiece's true field of view is the angle of sky seen through the eyepiece when it's attached to the telescope.