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6 terms
Photonics Dictionary: P
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eyepiece x
P x
parfocal eyepiece
One eyepiece of a set having equal distances from their mounting interface to their image plane, permitting freedom to interchange eyepieces without the need to refocus.
periplan eyepiece
A well-corrected flat-field eyepiece with good eye relief. Similar to a Huygenian.
pinhole eyepiece
A type of eyepiece, or the modification of an eyepiece, in which a small hole, without a lens, functions as the eye lens; used in the adjustment and alignment of microscopes.
pointer eyepiece
A Huygenian eyepiece containing a pointer at its focal plane that is used -- when viewing an object through the eyepiece -- for specific designation.
panoramic telescope
A telescope so manufactured that the image remains erect and the position of the eyepiece is unchanged as the line of sight is pointed in any horizontal direction.
prism binoculars
A pair of telescopes with prismatically erected images, mounted side by side with the eyepieces at the interocular distance of the observer. This separation is adjustable with a convenient millimeter...
Photonics Dictionary
P
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