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There is a wide range of optical designs of oculars. In the simplest case, there is only a biconvex lens or alternatively (for Galilean telescopes) a biconcave (negative) lens. Other designs contain two or more lenses; for example, the Huygens eyepiece and the Ramsden eyepiece contain two planar-convex lenses, namely a field lens and an eye lens. Other designs contain achromatic lenses for reducing chromatic aberrations. Further designs, which are optimized in various respects like a field of view and image distortions, are named after Georg Simon Plössl, Ernst Abbe and others.

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SC fiberconnector

The SC connector (short for Subscriber Connector, square connector or Standard Connector) mianly used in Datacom and telecom; GPON; EPON; GBIC, It features a 2.5mm Zirconia Ceramic ferrule and a push/pull coupling mechanism for a fast and reliable connection. The SC connectors are available for single mode UPC with blue…

Fiberconnectortypes

Exceptional glass laser lens produce better beam focus for more accurate target acquisition. 5. Light weight compact design make this laser shock resistant and ...

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There are complicated design trade-offs, and the best choice can substantially depend on the optical instrument, the operation conditions and the priorities concerning performance parameters. Cost and weight can be additional aspects to consider.

The magnification of an telescope or microscope can usually be understood as the product of the magnification factors of objective and ocular lens. The magnification of an eyepiece depends on its focal length. Generally, short focal lengths lead to higher magnification, but also to a smaller field of view and possibly stronger image distortions.

SCconnector

The LC connector (short for Lucent Connector, Little Connector, or Local Connector), It features a 1.25mm Zirconia ferrule in a small form factor (SFF) fibre optic connector housing with a snag free latch which gives an audible click upon engaging for reliable and high density connections. The LC connector complied…

The optical parameters of an ocular and not only the barrel diameter should fit to the optical instrument. It is sometimes possible to use oculars from different manufacturers with an instrument, but the performance may be degraded to some extent if the optical parameters do not fully fit.

The ST connector (Straight Tip or Bayonet Fiber Optic Connector ), mainly applied in Multimode, rarely single-mode, complied with IEC 61754-2, the ST Connector features a 2.5 mm ferrule with a quick release bayonet (stick and twist) style body for ease of use. ST connectors are available for single mode…

by JG Fujimoto · 2000 · Cited by 1572 — Optical coherence tomography (OCT) is an emerging technology for performing high-resolution cross-sectional imaging. OCT is analogous to ultrasound imaging, ...

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Rotate the scanning (4X) objective lens into position and use the coarse adjustment knob to move the stage and slide all the way up. 6. Look through the ocular ...

FC connectortypes

Further, the actual position of the exit pupil should be close to the position of the eye pupil, so that light which gets through the exit pupil can also enter the eye. The distance between the exit pupil and the physical end of the ocular is called the eye relief. Ideally, the eye relief should be at least about 5 mm, and possibly even 20 mm for observers wearing glasses. However, oculars with small focal length tend to have a smaller eye relief, e.g. only 2 or 3 mm, although there are design methods with which more can be achieved – possibly at the expense of other parameters. A particularly large eye relief is required for riflescopes because the recoil would otherwise push the ocular into the eye.

Polarization, also called wave polarization, is an expression of the orientation of the lines of electric flux in an electromagnetic field (EM field).

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The most frequently used barrel diameter for telescopes is 1.25 inches = 31.75 mm, but consumer devices may use smaller barrels of 0.965 inch = 24.5 mm, while there are also larger sizes such as 2 inch = 50.8 mm or even larger ones up to 4 inches for use in certain professional instruments. Large barrel diameters usually imply a higher price, but allow for a larger field of view for a given magnification.

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STConnector

Besides the eye lens, which does the actual imaging, an ocular can contain an additional field lens for expanding the field of view. If that field lens is placed in the intermediate image plane, it does not affect the image magnification. However, the field lens is sometimes slightly moved away from that location.

Power of a lens.P is defined as reciprocal of focal length in meter, 1/f and has unit in Diopter; D. Therefore for estimation of power we have ...

The FC connector (short for Ferrule Connector or Fiber Channel), it mainly applied for Datacom, telecom, measurement equipment, single-mode lasers; becoming less common, The FC connector features a 2.5 mm ferrule and a threaded metal coupling nut, for a secure connection in high vibration environments and in laboratory testing for consistent results. A range of FC connectors are manufactured including Standard, Premium Low Loss and High Performance Grades which are suitable for various applications. The FC Connectors are available for single mode UPC with blue boots, APC with green boots and multimode PC with black boots suitable for 900µm, 2mm or 3mm cable diameters.

Professional optical instruments usually allow the easy exchange of oculars and the use of oculars with different parameters. One can often modify the magnification of an instrument that way, and at the same time other parameters such as the field of view and the image brightness can change. Instruments normally have a standardized kind of barrel (sleeve) for insertion of an ocular. There is also a mounting thread with which the eyepiece can be fixed after insertion.

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Some optical instruments such as telescopes, infrared viewers and microscopes contain certain groups of optical elements, mostly lenses, which are called objectives and ocular lenses. While an objective is on the side of the observed object, the ocular lens (also called ocular or eyepiece, sometimes loupe) is on the side of the observing eye. It may contain a single optical lens or some combination of lenses and is normally placed in a cylindrical housing (barrel).

SC to LCconnector

ISO/IEC decided to name WBMMF Wideband Multimode Fiber as OM5 in Oct. 2016, this decision was made by ISO/IEC Joint Technical Committee 1 (JTC 1)/Subcommittee 25 (SC 25) Interconnection of Information Technology Equipment. At a spring 2016 meeting of JTC 1/SC 25’s Working Group 3 – Customer Premises Cabling –…

Filter, find, and compare Nikon microscope objective lenses with Nikon's Objective Selector tool.

Binoculars, infrared viewers and other compact optical instruments often have rigidly attached ocular lenses, which cannot be easily exchanged.

Note that the assumed pupil diameter is assumed to be significantly larger for an astronomical telescope than for a microscope because the viewing conditions are usually relatively dark, leading to a wide open eye.

The transverse limitations which an ocular imposes on the transmitted light are characterized with the diameter of the exit pupil. That diameter should approximately fit the diameter of the pupil of the observing eye: