31mm F1.8 Limited Pentax DA and DA lenses are the current lens line for Pentax Digital single lens reflex camera digital SLR cameras . They use the Pentax K sub AF sub Mount. All of these lenses have ... lenses are also made by third party companies. History Takumar lenses were primarily supplied ... began supplying lenses under the Pentax name in the early 1970s using a bayonet K mount. In addition ... adapter ever made, providing literally millions lens available. 35mm and 645 lenses optimized for digital .... Another feature that sets Pentax lenses apart from other manufacturers is that many of their top line lenses, like their camera bodies, are weather proof, allowing for their continued use in poor weather and wet locations. Pentax currently provides weather sealed premium lenses up 300mm, and by special ... lenses available up to the A 1200mm. With all major manufacturers, super telephotos of this range ... of third party lenses for Pentax cameras. Mounts Main article Pentax K mount Lens designations File Pentax SMC M 50mm f2.jpg thumb right Pentax SMC M 50mm f2 SMC lenses The first generation of Pentax K mount lenses with the SMC coating, these were exclusively manual focus lenses with no automatic features. M lenses The M series of lenses followed on from the earlier SMC lenses. As with the earlier lenses, these were manual K mount lenses without any automatic features. Some later Pentax digital cameras have had difficulty using the SMC and M lenses due to the lack of an automatic aperture setting. A lenses Another K mount lens, the A series of lenses saw the introduction of automatic aperture settings. The lenses had an aperture ring unlike the later DA series , and thus the aperture could .... F lenses The F series were autofocus lenses. They featured an aperture ring, which allowed the aperture to be controlled manually. Thus FA lenses are able to be used on older cameras which do not support automatic setting of the aperture, such as the Pentax K1000 . FA lenses File Pentax SMC ... more details
Transitions lenses were first produced by Transitions Optical in 1991. ref http www.babm.com featurestory Transitions Optical.htm ref Transitions lenses are called adaptive or photochromic lenses . ref Official website http www.transitions.com ref They are clear indoors and at night. They darken automatically when outdoor lighting changes and block 100 percent of UV rays. ref http www.wisconsinvision.com Products Transitions.htm ref They help the wearer to see better and help to reduce glare, eye fatigue and eye strain. ref http us.transitions.com NR rdonlyres AA45008F 9333 4718 93FE 325B66F81E11 0 Transitions VI FAQ.pdf ref . Most prescriptions can be made with Transitions lenses and they can be fitted in most eyeglass frames. ref http www.silvercreekoptical.com Products transitions faqs.html ref The lenses come in gray and brown shades, and are also available in a non prescription version. ref http www.allaboutvision.com lenses photochromic.htm ref Transitions lenses can be purchased at most local optical shops and regional or national retail stores. ref http en us.transitions.com EN WHERE TO BUY Pages default.aspx ref In addition to Transitions lenses, ref Citation title Make the Transition newspaper Skylights Magazine date March April 2010 ref ref Citation last Marie first Dee title Transitions Lenses Review url http momgadget.com index.php?s transitions accessdate 2 November 2010 ref there are also Transitions XTRActive lenses that change from light tint indoors to very dark outdoors ref http www.framesdirect.com transitions lenses.asp ref , and Transitions SOLFX sun lenses that adjust from dark to darker outdoors depending on the sun. ref Citation title Boat and Gear ... can explain the different kinds of Transitions lenses and recommend which Transitions lenses are right ... team, Team Garmin Cervelo, also race competitively wearing Transitions lenses. ref Citation title ... website Category Corrective lenses ... more details
camera optical lenses to the United States . Kino Precision was originally formed by a group of engineers ... format camera lenses. These lenses were offered in a variety of camera mounts to fit a number of different ... Series 1 manual focus lenses under contract for Vivitar , a U.S. lens distributor of after market film lenses for 35mm cameras. However, after the positive reception from consumers on Vivitar Series 1 lenses, the company believed the time was right to successfully market lenses to fit existing 35mm ... macro lenses, FOTO found the Kiron 105 2.8 macro outperformed both the Micro Nikkor 105mm 2.8 AIS and Tokina 90mm 2.5 macro lenses. ref , the 28 210mm 4.0 5.6 and the 3.8 5.6 varifocal zoom, and the 28 85mm 2.8 3.8 varifocal macro zoom lenses were praised in contemporary reviews of the day for their superb ... element of the kiron 80 200mm zoom to ensure that there were no flaws.html A Look Back At Lenses , 11 April 2009 ref Although reasonably priced for the level of quality offered, Kiron manual focus lenses ... for the Kiron 28 85 2.8 3.8 zoom was 449 1,060.00 in 2009 dollars. ref As such, Kiron lenses produced during the 1980s were normally priced only slightly below lenses offered by the camera manufacturers ... 1 macro lenses , and offered them for sale under the Vivitar brand. The increasing cost of quality lens ... lenses at a cost less than that charged by the camera manufacturers, who had begun to offer economy ... CVI Melles Griot Group in 2007. Types Lenses for 135 film 35 mm film cameras 24mm 1 2.0 28mm 1 2.8 ... 210mm 1 4.0 two versions 70 210mm 1 4.5 80 200mm 1 4.0 80 200mm 1 4.5 six versions Lenses were made ... of KIRON lenses? Category Photography companies de Kiron Objektive ... more details
Cleanup date March 2008 The Visby lenses sometimes also known as Fornsa lenses are a collection of Lens geometry lens shaped manufactured objects made of rock crystal quartz found in several Viking hoards on the island of Gotland , Sweden, dating from the 11th or 12th century. Some were in silver mounts with filigree , the mounting covering the back of the lens, and were probably used as jewellery it has been suggested that the lenses themselves are much older than their mounts. ref name schmidt cite journal last Schmidt first Olaf authorlink coauthors Karl Heinz Wilms, Bernd Lingelbach title The Visby Lenses journal Optometry & Vision Science volume 76 issue 9 pages 624 630 publisher location ... issn doi id accessdate ref Some of the lenses can be seen at the Fornsal historical museum in Visby ... Ahlstr m first Otto authorlink coauthors title Swedish Vikings used Optical Lenses journal The Optician ... previously assumed. Their aberration curve is very similar to modern aspheric lenses as used in spectacles. ref name schmidt Description The lenses are bi aspheric and have excellent imaging properties ... example of the lenses measures convert 50 mm in abbr on in diameter and convert 30 mm in abbr on thick at its centre, with an angular resolution of 25 30 m. The Visby lenses provide evidence that sophisticated ... that the knowledge required to make such lenses was restricted to only a few craftsmen, and perhaps a single person. It has been suggested that the lenses were not produced by the Vikings, as there are hints ... of beads and lenses from rock crystal, with unworked pieces of crystal coexisting with partially finished beads and lenses. ref cite web last Carlsson first Dan authorlink coauthors title Report ... been proposed for the lenses They may have been used for by craftsmen for magnification in fine work ... museum visby visby.htm Die Visby Linsen German, includes pictures of all the lenses found at Visby ... reports at Visby Category Archaeological artefacts Category Viking Age Category Lenses da Visby linserne ... more details
Orphan date February 2009 Cleanup date June 2007 Strategic lenses are a concept of strategic management . They are the four angles from which strategy can be viewed and implemented on a corporate level. Strategy As Design This lens views Strategy development as a process of logical determinism. Through careful evaluation of the firm s industry, environment and available resources, the optimal strategy and clear direction can be determined. ref name Nideborn cite web url http www.ie.lth.se Education Exjobb exjobb 2007 NidebornStrahle.pdf title Where Is the Semiconductor Industry Going? last Nideborn first Joakim coauthors Kristina Str hle date December 2007 accessdate 2008 09 27 format PDF ref This strategic process thus follows an analysis selection implementation process. Fundamental to this view is that the responsibility of strategy development is top management driven and that they are capable of choosing the optimal strategy for the business. Strategy As Experience Many proponents of the view of Strategy As Experience, such as Henry Mintzberg would argue that the design lens is often inaccurate as top level executives are too distant from daily developments of the organisation. According to Minzberg, strategic development should be adaptive, and divides it into intended, realised and emergent strategies. In this model, strategic development is the continuous adaptation of past strategies based on experience. ref name Nideborn In this view strategy is greatly influenced by taken for granted assumptions culture and involves large levels of bargaining and negotiation. Strategy as Experience carries with it a risk of the effect known as Strategic management Strategic change strategic drift as a result of failing to act upon environmental changes by being too path dependent on past activity. Remember the 4 lenses are a theory of strategic management. Strategy As Ideas ... Lenses Category Management ... more details
or EOS Kiss Digital X , one instead uses 50mm 85mm lenses, as these provide a 35 mm equivalent focal length of 80mm 136mm. Lenses that fit these criteria are Canon EF 50mm lens EF 50mm lenses F 1.2 ... L. last Castleman edition 3rd citation url http www.the digital picture.com Canon Lenses Canon Portrait ... app html EFLenses101 app portrait.html title EF Lenses 101 Applications Portrait author ... Lenses for the Canon EOS system author Bob Atkins refend Canon EF lenses DEFAULTSORT Portrait Lenses Category Canon EF lenses ... more details
A collection of lenses a DSLR owner might have. These are three Olympus zooms 40 150 mm, 11 22 ... is on modern lenses for 135 film 35 mm film SLRs and for DSLRs with Image sensor format ... lenses The major advantage of SLR and DSLR cameras is the possibility of changing lenses, to select the best lens for the current photographic need, and to allow the attachment of specialized lenses. Film ... lenses have been produced, both by camera manufacturers who typically only make lenses intended for their own camera bodies and by third party optics companies who may make lenses for several different ... their DSLRs 100 compatible with their existing SLR lenses in the beginning, allowing owners of new DSLR s to continue to use their existing lenses and get a longer lifespan from their investment. Others, for example Olympus company Olympus , chose to create a completely new lens mount and series of lenses ... the MZ and ZX series of Pentax film cameras that do not work with some of the older lenses. ref http www.mosphotos.com PentaxLensCompatibility.html ref As implied by the above, lenses are only directly ... settings. The normal full stop f number scale for modern lenses is as follows 1, 1.4, 2, 2.8, 4, 5.6, 8, 11, 16, 22, 32, but many lenses also allow setting to half stop or third stop increments ... from 1 to 4. Fast lenses are typically larger than slow lenses for comparable focal length , and typically ... has a longer focal length, and images a small portion of the scene, making it seem closer. Lenses are not labeled ... in millimeters. But this specification is insufficient to compare lenses for different cameras ... focal length is 28 mm. This way of talking about lenses is not just limited to SLR and DSLR lenses it is very common to see this focal length equivalency in the specification of the lens ... E 30 br Olympus E 620 br Panasonic Lumix DMC G1 Panasonic DMC G1 Types of lenses Zoom lenses Image ... of image quality in zoom lenses relative to non zoom lenses is minimal, and zoom lenses have ... more details
The following list of Nikon F mount lenses with integrated autofocus motors includes F Mount Photographic lens lenses which fully autofocus on Nikon F single lens reflex camera s without an autofocus electric ... lenses designated with AF S introduced 1996 and the older AF I introduced 1992 fully autofocus on these cameras ... Nikon Lens Compatibility ref Other manufacturers have different or no designations for lenses including a focus motor. AF Lenses without an autofocus motor do work fully, but lack autofocus function ... here are nearly all recent autofocus lenses, because all manufacturers except Tokina have included focus motors in their Nikon compatible lenses for years. On August 19, 2010 the list is supposed to be complete, including 144 past and present lenses with 24 compatible teleconverters as well as 3 Extension tube lens extension tubes with support for integrated autofocus motors. The lenses are ordered ... operation. All Nikon zoom AF lenses have focal length encoders added. Nikon AF I The lens contains ... . All full frame Nikon DSLRs are able to detect DX lenses and crop the image accordingly. u Sigma .... No special designation for Nikon NIKKOR. All fullframe lenses can be fully used on DX DSLRs with the advantage ... old Nikon film SLR bodies. ref name kenrocklens All G type lenses are also D type. All IF The lens ... rarely available as new. Nikon Nikkor 63 lenses ref http www.nikonusa.com Find Your Nikon Camera Lenses index.page Nikon.com NIKKOR Lenses Table needs Javascript ref Image Nikkor ... Nikon lenses Nikon lenses Telephoto Nikon 55 200mm f 4 5.6G AF S Zoom Nikkor AF S DX 55 200mm ... N name NT Will only mount original Nikon Nikkor AF S and AF I lenses without modification . http ... tcmod index.html Can not mount lenses which jut out the F mount. Not recommended for use with Nikkor DX lenses although it works with modification . http imaging.nikon.com products ... TC 20E u sup sup ref group N name NT Nikon notes Reflist group N Sigma 51 lenses ref http www.sigmaphoto.com ... more details
wiktionarypar plano convex Plano convex may refer to Plano convex lenses, in optics see Lens optics Types of simple lenses The plano convex type of mudbrick , used by the ancient Sumerians disambig ... more details
comfortably. Indications for use Scleral lenses may be used to improve vision and reduce ... also may be treated by the use of scleral lenses. Use in special effects Special effect scleral lenses have also been used to produce eerie eye effects in films, such as the whited out eyes of the monsters ... . These lenses tend to be uncomfortable and sometimes impede the actors vision, but the visual effects produced can be striking. The lenses cost around 300, are custom made to fit the wearer s eyes and can also be custom painted, although most companies only sell lenses with a pre designed look. There are many different designs available, from standard black lenses to flame effect eyes, as well ... variety of lens is worn. If looked after, the lenses can be kept for around one year. It is recommended ... links http keratoconusinfo.wordpress.com Use of Scleral lenses in Keratoconus http www.eyefreedom.com slenses.php Scleral lenses http www.sclerallens.org Scleral Lens Education Society http bostonsight.org ... 9mm Special Effects Lenses http keratos.free.fr english scleral lenses keratos.htm Scleral lenses used for ocular surface diseases treatment stub Category Contact lenses Category Corrective lenses ... more details
Orphan date February 2009 Unreferenced date March 2008 Knapp s Rule states that Lens optics lenses placed at the anterior Focus optics focal point of the human eye eye , generally 15 mm in front of the eye, will create similarly sized images on the retina , whenever the disparity between the two eyes is due to a difference in axial length of the eyes. When a refractive error is corrected with spectacles spectacle lenses, the retinal images change size. It is magnified with Lens optics Types of simple lenses convex lenses and minified with Lens optics Types of simple lenses concave lenses . One difficulty, then, in prescribing glasses to an individual with a disparity in refractive error between the two eyes is that a disparity in image size between the two eyes may be created. There is some controversy as to the soundness of Knapp s Rule. References reflist optics stub Category Ophthalmology ... more details
Summary This photograph shows ChromaGen lenses in both coloured and neutral appearance that both have similar effects Licensing PD self date June 2007 ... more details
Unreferenced date February 2007 A triplet lens is an optics optical device consisting of three single Lens optics lenses . The triplet design is the simplest to give the required number of Degrees of freedom physics and chemistry degrees of freedom to allow the lens designer to overcome all Seidel aberration s. The term is used in two ways. The three lenses may be cemented together, as in the Steinheil triplet . Or a triplet may be designed with three spaced glasses, e.g. the Cooke triplet . Category Lenses optics stub ... more details
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