Assertion: eyepiece | /r/ObjectUse | used with the telescope
Facets:
Source sentences:
text: Thus if you insert a 3x Barlow lens into the back of a telescope with 1000 mm focal length, the combined focal length of the telescope and Barlow lens becomes 3000 mm, and the magnification of any eyepiece used with the telescope will be tripled when it is used with the Barlow lens, compared to the magnification without.
text: Eyepieces, which are used with both refractors and reflectors (see below Reflecting telescopes), have a wide variety of applications and provide observers with the ability to select the magnification of their instruments.
text: The eyepiece used with a telescope magnifies the image that is formed by the main optical system.
text: It is common for users of an eyepiece to want to calculate the actual field of view, because it indicates how much of the sky will be visible when the eyepiece is used with their telescope.
text: Thus if you insert a 3x Barlow lens into the back of a telescope with 1000 mm focal length, the combined focal length of the telescope and Barlow lens becomes 3000 mm, and the magnification of any eyepiece used with the telescope will be tripled when it is used with the Barlow lens, compared to the magnification without.