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Topic: Focus (optics)


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In the News (Sun 21 Jul 19)

  
  Laser Focus World - Optics News and Information- Laser Focus World
Optics, or the manipulation of light by mirrors, lenses, prisms, diffraction gratings, and/or other optical elements, is a discipline that has been around for thousands of years.
Because the use of fiber optics or optical fiber for communications requires that the data be sent using a laser, fiber optic communications are also commonly referred to as fiber optic laser communications or simply laser communications (although laser communications can also occur in free space without the use of optical fiber).
In addition to communications purposes, fiber optics can also be used to deliver light for the purpose of industrial and fiber optic lighting in homes, automobiles, or in other fiber optic illumination applications such as the use of large-core optical fibers for light delivery in medical and microscopy applications.
lfw.pennnet.com /resource/optics   (694 words)

  
 Focus Optics Pty Ltd - Services
Focus Optics wide experience in the area of contact lens fitting and problem solving involves working closely with Doctors in the provision of lenses for injured eyes and unusual conditions requiring specialised fining.
Focus optics contact lens fitters and technicians bave a combined experience of 80 years in the contact lens industry.
Focus Optics extensive range of spectacle frames including the leading brands of Rodenstock Safilo, Schaeffer and Oroton allow us to expertly fit and dispense the best in optical eyewear.
www.focusoptics.com.au /services.html   (315 words)

  
 Focus (optics) - Wikipedia, the free encyclopedia
This non-ideal focusing may be caused by aberrations of the imaging optics.
The focus of a hyperbolic mirror is either of two points which have the property that light from one is reflected as if it came from the other.
Conversely, it can focus rays directed at the focal point that is behind the mirror towards the focal point that is front of the mirror as in a Cassegrain telescope.
en.wikipedia.org /wiki/Focus_(optics)   (504 words)

  
 Writing beam focus monitor - Patent 4499569
In analyzing the optics involved in such a system, the fact that a cone-shaped beam is produced by the diverging lens permits a pair of conjugate points to be developed, one at the surface of the videodisc and the other at the focus point on the photodetector.
Accordingly, optimum focus and signal recovery can be gained by monitoring the signal level developed at the photodetector, adjusting the objective lens focussing the beam on the disc until a maximum signal is recovered, and then adjusting the spacing between the polarizing cube and the photodetector until the signal is again maximized.
The focus detectors and monitors of the prior art work effectively by analyzing changes in the divergence of the long conjugate of the objective lens thereby inferring the length of the short conjugate of the objective lens as dictated by well known laws of optics.
www.freepatentsonline.com /4499569.html   (5507 words)

  
 Soft focus - Wikipedia, the free encyclopedia
A soft focus lens deliberately introduces spherical aberration in order to give the appearance of blurring the image while retaining sharp edges; it is not the same as an out-of-focus image, and the effect cannot be achieved simply by defocusing a sharp lens.
The soft focus effect is used as an effect for glamour photography, because the effect eliminates blemishes, and in general produces a dream-like image.
The effect of a soft focus lens is sometimes approximated by the use of diffusion filter or other method, such as stretching a nylon stocking over the front of the lens, or smearing petroleum jelly on a clear filter or on the front element of the lens itself.
en.wikipedia.org /wiki/Soft_focus   (363 words)

  
 X-ray optics releases new potential in mature technology
Although x rays are not new, the past several years has been marked by innovative development in new materials and approaches to x-ray optics, lifting x-ray exploration to new levels of importance by increasing the capabilities of a range of widely used systems from the scanning electron microscope to mammograms and clinical x rays.
By combining many concentric cones, the optic is able to focus (or collimate depending on the source location in respect to the optic) a greater percentage of the radiation.
Although optics that depend on total external reflectance such as polycapillaries, nested cone and multilayer mirrors are highly transmissive for the correct incident angle, attention is gaining for refractive x-ray optics for imaging applications.
www.spie.org /web/oer/may/may99/xray.html   (2063 words)

  
 Line focus optics for cleaning railroad rails with computercontrolled focus position - Fraunhofer Institute for Laser ...
The use of motorized focus position setting and an integrated camera system for monitoring the focus position should appreciably simplify the installation and operation of the optical system and ensure a high cleaning speed.
Owing to its large dynamic range, a CMOS camera, which is coaxially integrated in the beam path, is used to detect the size of focus on the rail.
The laser radiation scattered on the rail surface is collimated by the focusing lens group and is decoupled by a divider mirror.
www.ilt.fraunhofer.de /eng/100685.html   (385 words)

  
 Snipers Paradise   (Site not responding. Last check: 2007-10-13)
Target optics are typified by fixed high magnification, finger adjustments and a simple crosshair or a single dot style reticle (dot in the middle of a crosshair).
The one thing that target optics normally have is optical clarity, this combined with high magnification allow bench rest shooters to place numerous rounds into one hole (of course the superb rifle doesn't hurt either).
Tactical optics are available in different types of adjustment such as ¼ moa up to 1 moa depending on the model and the intended use.
www.snipersparadise.com /training/newoptics.html   (2025 words)

  
 CCD Imaging Manual - Chapter 1   (Site not responding. Last check: 2007-10-13)
To maintain focus when the steel framework changes length with changes in attitude and temperature, the distance between the primary mirror cell and the fixed top ring is compared with a tensioned invar wire.
The profile of the prime focus cage is a semi-circle with diameter 1450mm centred on the optical axis and joined to a semi-circle of the same size displaced 115mm from the axis.
The focal reducer converts the f/3.3 prime focus beam of the AAT to f/1, and consists of a hyperbolic mirror and three BK-7 glass lenses optimised for imaging in the 5000-9000Å region.
www.aao.gov.au /AAO/local/www/cgt/ccdimguide/ccd_chap1.html   (2809 words)

  
 CAVE | Projects: Depth from Defocus
The relative blurring in two images is computed using a narrow-band linear operator that is designed by considering all the optical, sensing and computational elements of the depth from defocus system.
Defocus invariant magnification is achieved by the use of an additional aperture in the imaging optics.
The magnification variation is shown via the optical flow field that is generated when the focus setting is varied.
www1.cs.columbia.edu /CAVE/projects/depth_defocus/depth_defocus.php   (627 words)

  
 Amazon.de: Optics and Focus for Camera Assistants: Art, Science and Zen: English Books: Fritz Hershey   (Site not responding. Last check: 2007-10-13)
Focus (roughly) is the intersection of light rays to form an image. Lesen Sie die erste Seite
While the title is "Optics and Focus for Camera Assistants" only about half of the book concerns itself with the title subjects.
The one chapter on focus estimation tricks and lens marking techniques is fair.
www.amazon.de /Optics-Focus-Camera-Assistants-Science/dp/0240802004   (534 words)

  
 Optics Summary
Optics is the branch of physics that is concerned with light and its properties.
Geometric optics is the study of the path of light rays through systems of lenses, mirrors, and other media.
The interest in the study of the laws and phenomena of optics was one of the most popular and potentially important scientific pursuits of the Middle Ages.
www.bookrags.com /Optics   (348 words)

  
 focus - Search Results - MSN Encarta
Focus (geometry), a fixed point in a plane that, in combination with a particular straight line or another point, specifies a type of curve called a...
Earthquake: Focus and Epicenter, glossary of earthquake terms
Focus (optics) : eye: different focuses of the eye (pictured)
encarta.msn.com /focus.html   (184 words)

  
 The Finest Benchtop Comparator Optics   (Site not responding. Last check: 2007-10-13)
The optics in the Focus Contour Projector provide constant image brightness regardless of magnification and produce a corrected image with flat field, superb contrast, and sharp images.
This ensures that the magnification of the image remains accurate even when different operators focus the system at different positions.
Focus uses OGP Fresnel lens technology to focus screen illumination at the normal viewing position.
www.ogpnet.com /ogpTechFocusOptics.jsp?localeId=2   (140 words)

  
 Laser Ablation Optics   (Site not responding. Last check: 2007-10-13)
In addition, since the coupling optics are far less expensive than the laser and microscope, you can lavish attention on this part of your system without much increasing the overall cost.
Lens y can be moved along the beam axis to adjust the focus of the laser so that it corresponds to the image you see.
Parallel rays going into an infinity-corrected objective won't focus precisely at the image plane, and the light coming out of the laser isn't precisely parallel, and the point of maximum damage will not correspond precisely to the focus of the beam.
eatworms.swmed.edu /Worm_labs/Avery/Laser/optics.html   (992 words)

  
 oe magazine - Taking Optical Precision to the Extreme   (Site not responding. Last check: 2007-10-13)
Developing the capability to produce EUV optics to the required surface figure, mid-frequency error, and surface roughness required a much more rigorous understanding than previously available of the physics and chemistry of the optical manufacturing process.
ASML Optics is also applying these standards, fabrication and metrology technologies to the wavefront correction of large-field optics that may potentially be used in a leading space agency program to secure images of planets orbiting nearby stars, exploring a method for producing such large-aperture, high-performance systems rapidly and economically.
ASML Optics is applying CCOS, multiple decade spatial frequency metrology, and precision metrology standards to optics used from 633 nm to 157nm.
oemagazine.com /fromTheMagazine/nov04/uvoptics.html   (1540 words)

  
 Amazon.com: Optics and Focus for Camera Assistants, Art, Science and Zen: Books: Fritz Hershey   (Site not responding. Last check: 2007-10-13)
Stressing theory as well as hands-on experience, Optics and Focus for Camera Assistants melds technical knowledge and skills with technique and attitude to provide key information on one of the most vital parts of a camera assistant's job: focus.
In addition to covering such important topics as diagnostic optics for use in the field, fundamental and advanced estimating and focus techniques, and depth of field, Optics and Focus for Camera Assistants also offers essential information on how best to be mentally and physically prepared for the job.
Focus (roughly) is the intersection of light rays to form an image.
www.amazon.com /Optics-Focus-Camera-Assistants-Science/dp/0240802004   (1389 words)

  
 CDM-Optics   (Site not responding. Last check: 2007-10-13)
A number of unique designs were proved as part of the contract including a fast and compact singlet imaging system, a passive IR imaging system that is insensitive to temperature related aberrations over a 70 C temperature range, and a 10X single element plastic microscope objective corrected for all imaging aberrations.
CDM Optics was awarded a contract by the National Institutes of Health to design and develop a Wavefront Codedâ„¢ fluorescence microscope system that is fast, low cost, and readily available to biological researchers working in a number of disciplines.
A Wavefront Codedâ„¢ microscope is a traditional microscope with the addition of a specialized aspheric optic mounted at a slider location, followed by digital processing, which increases the depth of focus of the resulting images.
www.cdm-optics.com /site/news.php   (776 words)

  
 IPO Focus: Fiber optics illusion - Nov. 2, 2000
But the recent sluggishness in the fiber optic sector may lessen some of the company's glitter in the eyes of IPO investors, although analysts are still calling it among this week's best buys.
However, the company hasn't generated the buzz that a fiber optics deal normally does because it is not a flashy startup and lacks the backing of a high-profile venture capital firm, Nichols said.
Fiber optics has long been viewed as one of the strongest sectors in the IPO market.
money.cnn.com /2000/11/02/deals/ipo_focus   (931 words)

  
 Optics for the Tropics, Inc.
Optics for the Tropics, Inc. is a 501(c)(3) charity organization providing quality optical equipment in the Caribbean and Latin America where resources are very limited.
Our vision is two fold; to increase the resources needed to improve monitoring, inventory, research, management, and education regarding birds and their habitats in the Caribbean and Latin America, and to strengthen partnerships that work towards a comprehensive bird conservation effort.
The focus of Optics for the Tropics, Inc. is, of course, optical equipment.
www.opticsforthetropics.org   (305 words)

  
 X-ray concentrator will expand window on high-energy universe
Capillary optics start out as bundles of glass tubes that are heated and drawn until the bundles are just 300 to 600 microns wide and contain hundreds to thousands of channels 3 to 50 microns wide.
The technology of capillary optics is relatively new, having been conceived in the Former USSR in the 1980s.
Placing a capillary optic lens against the patient's skin can capture the X-rays as they leave the body and reduce the blurring, increasing the chances of early detection.
science.nasa.gov /newhome/headlines/ast14jan99_1.htm   (1784 words)

  
 FU1000 Compound Optics Focus Block
Based on ML7000 metallurgical components, the FU1000 Compound Optics Focus Block can be the starting point for a custom microscope designed to fit your application or a turnkey OEM/VAR solution.
This compound optics focus block can also mount on a wide variety of boom or pole stands or simply bolted onto any vertical plate accommodating the bolt pattern making it possible for it to be mounted virtually anywhere.
This focus block accepts either a fiber optic light source with light guide and vertical illuminator (MA806) or an integrated 6V 30W halogen, full Koehler vertical illuminator (MA651/100).
www.meijitechno.com /compound_focus_block.htm   (516 words)

  
 Financial focus - optics.org
The UK optical component maker also announced it is ditching its ASOC platform, a move that will eliminate up to 180 jobs through the closure of its Milton plant in the UK.
• The research and semiconductor capital equipment markets have yet to show any solid signs of recovery and will remain sluggish throughout the third quarter of 2003, according to New Focus’ president Nic Pignati as he announced a second quarter loss of $7.2million.
This compares with a net loss of $5.1million in the previous quarter and a net profit of USD 5.3million for last year’s second quarter.
optics.org /articles/news/9/8/3   (419 words)

  
 allaboutoptics.com - Binocular Review - Comparing High-End Binoculars
To someone less familiar with optics, a difference of 5 to 10 ounces may not seem like much, but once you hit about 25 ounces you can really feel every additional ounce.
There is no negative trade-off (when comparing internal-focus roof prism binoculars) to close focus ability so it is becoming more common for binoculars to focus down to 10 feet or less.
The optics in these 13 binoculars are all of superior quality and performance.
www.allaboutoptics.com /rev-bino-a1.html   (1842 words)

  
 Canon Technology -Prime Focus Corrector Lens for the Subaru Telescope-
It has always been extremely difficult, however, to install optics systems in the primary focus of large reflecting telescopes, because conventional optics designs made the system itself too large to be installed in the head of the telescope.
Compared with the 6 arcmin viewing angle of the Cassegrain focus, the prime focus realizes an angle of view that is 25 times wider in area.
In addition, the prime focus corrector lens optics system incorporates a high-accuracy compensation function that corrects for atmospheric dispersion, which occurs due to differences in refractive index depending on the wavelength of light entering the earth’s atmosphere from distant stars.
www.canon.com /technology/canon_tech/explanation/subaru.html   (522 words)

  
 Hi-Spy Viewing Machines Coin Operated Binocualars
Many people prefer the wider field of view in a binocular since the field of view of binocular-optics is far wider at any distance and therefore binocular optics are better for the overall view.
Automatic /Fixed / No-focus optics use the your eyes' own lens to make the image focus and guess what?-- if you've got less than perfect or corrected vision (and a large majority of the population do) you won't be able to get a sharp image because your eye can't give that sharp focus.
Our exceptional focus system, overbuilt vertical movement and super smooth horizontal movement are just three examples of our commitment to innovate.
www.hispyviewing.com /faq.htm   (1180 words)

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