eyepiece
Also known as ocular lens, ocular
thumb|right|250px|A collection of different types of eyepieces.
~36 min read
Article
31 sectionsContents
- Properties
- Design distance to entrance pupil
- Elements and groups
- Internal reflection and scatter
- Chromatic aberration
- Focal length
- Location of focal plane
- Field of view
- Barrel diameter
- Telescope eyepieces
- Microscope eyepieces
- Eye relief
- Designs
- Negative lens or "Galilean"
- Convex lens
- Huygens
- Ramsden
- Kellner or "Achromat"
- Plössl or "Symmetrical"
- <span class="anchor" id="Abbe_ortho_anchor"></span> Orthoscopic or "Abbe"
- Monocentric
- Erfle
- König
- RKE
- Nagler
- Electronic eyepieces
- Footnotes
- See also
- References
- Sources
- External links
thumb|right|250px|A collection of different types of eyepieces.
An eyepiece, or ocular lens, is a type of lens that is attached to a variety of optical devices such as telescopes and microscopes. It is named because it is usually the lens that is closest to the eye when someone looks through an optical device to observe an object or sample. The objective lens or mirror collects light from an object or sample and brings it to focus creating an image of the object. The eyepiece is placed near the focal point of the objective to magnify this image to the eyes. (The eyepiece and the eye together make an image of the image created by the objective, on the retina of the eye.) The amount of magnification depends on the focal length of the eyepiece.