Relevant bibliographies by topics / Telephoto lenses

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  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers

Academic literature on the topic 'Telephoto lenses'

Author: Grafiati
Published: 4 June 2021
Last updated: 5 March 2023

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Journal articles on the topic "Telephoto lenses"

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Aldelgawy, Mohammed, and Isam Abu-Qasmieh. "CALIBRATION OF SMARTPHONE’S REAR DUAL CAMERA SYSTEM." Geodesy and cartography 47, no. 4 (December 13, 2021): 162–69. http://dx.doi.org/10.3846/gac.2021.13434.

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This paper aims to calibrate smartphone’s rear dual camera system which is composed of two lenses, namely; wide-angle lens and telephoto lens. The proposed approach handles large sized images. Calibration was done by capturing 13 photos for a chessboard pattern from different exposure positions. First, photos were captured in dual camera mode. Then, for both wide-angle and telephoto lenses, image coordinates for node points of the chessboard were extracted. Afterwards, intrinsic, extrinsic, and lens distortion parameters for each lens were calculated. In order to enhance the accuracy of the calibration model, a constrained least-squares solution was applied. The applied constraint was that the relative extrinsic parameters of both wide-angle and telephoto lenses were set as constant regardless of the exposure position. Moreover, photos were rectified in order to eliminate the effect of lens distortion. For results evaluation, two oriented photos were chosen to perform a stereo-pair intersection. Then, the node points of the chessboard pattern were used as check points.
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Xu, Chun Yun, Jia Ning Dong, Su Zhang, and Wen Sheng Wang. "Infrared Telephoto Design Used in Joint Transform Correlator." Key Engineering Materials 552 (May 2013): 21–26. http://dx.doi.org/10.4028/www.scientific.net/kem.552.21.

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In order to meet the requirement of tank sight and improve the ability of Joint Transform Correlator(JTC) in target detection and recognition, the infrared telephoto system with high image quality and high performance-price ratio is designed for wavelength 8μm～12μm. Initial structure is composed of four refractive lenses. The focal length is 200 mm, the relative aperture is 1:2.6 and image field of view is 1 inch (CCD). Considering the fabrication process, production cost and other factors, the system structure is further improved. First the telephoto which is composed of four lenses is designed with normal spherical surface. Then on the basis of the original spherical structure, an aspheric surface is introduced. The optical system can be reduced into three lenses. The image quality of the whole system becomes much better. The optical system image quality is evaluated with ZEMAX optical design software. The result shows that MTF of each field is close to the diffraction-limited curve at the cut-off frequency 17lp/mm. The spot diagram RMS radiuses are smaller than the radius of Airy disk 25.35μm. The wave front aberrations for all the fields are less than 0.25λ. The telephoto can meet the requirement of target detection. Combining JTC with this infrared telephoto lens, the infrared target at longer distance can be detected and recognized.
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Yu, Linzhi, Dahai Li, Yilang Ruan, Xinwei Zhang, Ruiyang Wang, and Kaiyuan Xu. "Wavefront Aberration Measurement Deflectometry for Imaging Lens Tests." Applied Sciences 12, no. 15 (August 4, 2022): 7857. http://dx.doi.org/10.3390/app12157857.

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Lenses play an important role in imaging systems. Having an effective way to test the aberrations of imaging lenses is important. However, the existing methods cannot satisfy the requirements in some conditions. To overcome these difficulties, wavefront aberration measurement deflectometry (WAMD) is proposed in this paper, which can reconstruct the wavefront aberrations of imaging lenses by measuring the angular aberrations. The principle of WAMD is analyzed in detail, and the correctness and feasibility of the proposed method are verified by both a simulation and an experiment. A telephoto lens and a single imaging lens were tested in an experiment, and the RMS errors were 166.8 nm (5.71%) () and 58.9nm (4.74%) (), respectively, as compared with the interferometer’s results. This method is widely applicable with relatively reasonable accuracy. It has potential to be applied in the lens manufacturing and alignment process.
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Harper, Bernard, and Richard Latto. "Cyclopean Vision, Size Estimation, and Presence in Orthostereoscopic Images." Presence: Teleoperators and Virtual Environments 10, no. 3 (June 2001): 312–30. http://dx.doi.org/10.1162/105474601300343630.

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Stereo scene capture and generation is an important facet of presence research in that stereoscopic images have been linked to naturalness as a component of reported presence. Three-dimensional images can be captured and presented in many ways, but it is rare that the most simple and “natural” method is used: full orthostereoscopic image capture and projection. This technique mimics as closely as possible the geometry of the human visual system and uses convergent axis stereography with the cameras separated by the human interocular distance. It simulates human viewing angles, magnification, and convergences so that the point of zero disparity in the captured scene is reproduced without disparity in the display. In a series of experiments, we have used this technique to investigate body image distortion in photographic images. Three psychophysical experiments compared size, weight, or shape estimations (perceived waist-hip ratio) in 2-D and 3-D images for the human form and real or virtual abstract shapes. In all cases, there was a relative slimming effect of binocular disparity. A well-known photographic distortion is the perspective flattening effect of telephoto lenses. A fourth psychophysical experiment using photographic portraits taken at different distances found a fattening effect with telephoto lenses and a slimming effect with wide-angle lenses. We conclude that, where possible, photographic inputs to the visual system should allow it to generate the cyclopean point of view by which we normally see the world. This is best achieved by viewing images made with full orthostereoscopic capture and display geometry. The technique can result in more-accurate estimations of object shape or size and control of ocular suppression. These are assets that have particular utility in the generation of realistic virtual environments.
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Dong, Jia Ning, Da Mu, and Chun Yun Xu. "Athermal Design of Infrared Telephoto Used in Joint Transform Correlator." Key Engineering Materials 552 (May 2013): 57–63. http://dx.doi.org/10.4028/www.scientific.net/kem.552.57.

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On the basis of optical correlation detection, joint transform correlator(JTC) is widely used in military, aviation and intelligentization and so on. It has the advantages of great flexibility and high precision of recognition. The optical system is applied to receive the infrared radiation of the target. Athermalization is the key to stabilizing the optical performance with respect to off-design temperature. Therefore, the image quality of optical system in different temperatures plays an important role in JTC. In order to improve the environmental adaptability of JTC, the infrared telephoto system with high image quality and high performance-price ratio is designed for wavelength 8μm～12μm to detect target in a large range of temperature. This telephoto lens is composed of four refractive lenses. Three materials, zinc selenide, germanium and zinc sulfide are used to compensate for the temperature. The focal length is 200 mm, the relative aperture is 1:3, and the field of view is 6.4°. This system has the characteristics of small volume and compact structure. The optical system image quality is evaluated with ZEMAX optical design software. The results have shown that MTFs in the range of -40°C to +60°C are all closed to the diffraction limited curve. The spot diagram RMS radius of each field is closed to the Airy disk radius. The system meets the requirements of technical specification and improves the ability of JTC in target tracking and recognition.
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Merlin, J. C. "New Trends in the Discovery of Comets by Amateurs." International Astronomical Union Colloquium 98 (1988): 163. http://dx.doi.org/10.1017/s0252921100092642.

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AbstractThe ways in which amateurs may increase their chances of discovering comets were described. Amateurs discover a considerable proportion of comets, but their contribution is greater among long-period comets. The relative proportions of short-period comets is revealing: 1 in 2 for professional astronomers, 1 in 8 for amateurs. Professional discoveries are largely a by-product of searches for asteroids: the comets have low inclinations (i < 30°) and are faint (m1 > 14). Amateurs are most successful in areas close (<60°) to the Sun. Typical apertures are 150-mm, and most comets are brighter than magnitude 10.Past results show that there is a strong correlation between number of observers and number of discoveries. Several amateurs have discovered comets at great elongations with larger telescopes (≥ 400 mm). The comets tend to be fainter (10 < m1 < 12). Several comets have been discovered with simple equipment (200- or 300-mm telephoto lenses) down to magnitude 13.Calculations of the distribution of discoverable comets show that an average of 14 comets (9 < m1 < 14) are missed per year.
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Samsudin, Dahrum, Safwan Othman, M. D. Anuar, Bukhari Manshoor, and Amir Khalid. "Experimental Investigation of Mixture Formation and Flame Development Using the Basics Technique of Schlieren Optical Visualization Principle." Applied Mechanics and Materials 660 (October 2014): 474–78. http://dx.doi.org/10.4028/www.scientific.net/amm.660.474.

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The Schlieren technique remains to be one of the most powerful technique to visualize the flow and it is relatively easy to implement, high and variable sensitivity, low cost and its used conventional of light. This technique allows us to see the invisible of the optical inhomogeneities in transparent media like air, water and glass that otherwise cause only ghostly distortions of our normal vision. This research investigates the mixture formation and flame development of biodiesel fuel using the Schlieren optical visualization principle. This method can capture spray evaporation, spray interference, mixture formation and flame pattern clearly with real images. During the experiment, the camera lens was used with telephoto lenses (Nikon 70-300mm f/4-5.6G) in order to capture a large amount of light especially the low flame intensity during the initial flame development. The flame development was captured with color images from a color digital video camera. This method can capture the flow of fluids of varying density, such as spray evaporation, spray interference and mixture formation clearly with real images. The result shows that the mechanism of fuel-air mixing and a better comprehension of combustible mixture that can give valuable information to improve and optimize the combustion process.
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Lokhorst, Deborah, Roberto Abraham, Imad Pasha, Pieter van Dokkum, Seery Chen, Tim Miller, Shany Danieli, et al. "A Giant Shell of Ionized Gas Discovered near M82 with the Dragonfly Spectral Line Mapper Pathfinder." Astrophysical Journal 927, no. 2 (March 1, 2022): 136. http://dx.doi.org/10.3847/1538-4357/ac50b6.

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Abstract We present the discovery of a giant cloud of ionized gas in the field of the starbursting galaxy M82. Emission from the cloud is seen in Hα and [N ii] λ6583 in data obtained though a small pathfinder instrument used to test the key ideas that will be implemented in the Dragonfly Spectral Line Mapper, an upcoming ultranarrow-bandpass imaging version of the Dragonfly Telephoto Array. The discovered cloud has a shell-like morphology with a linear extent of 0.°8 and is positioned 0.°6 northwest of M82. At the heliocentric distance of the M81 group, the cloud’s longest angular extent corresponds to 55 kpc and its projected distance from the nucleus of M82 is 40 kpc. The cloud has an average Hα surface brightness of 2 × 10−18 erg cm − 2 s − 1 arcsec − 2 . The [N ii] λ6583/Hα line ratio varies from [N ii]/Hα ∼ 0.2 to [N ii]/Hα ∼ 1.0 across the cloud, with higher values found in its eastern end. Follow-up spectra obtained with Keck LRIS confirm the existence of the cloud and yield line ratios of [N ii] λ6583/Hα = 0.340 ± 0.003 and [S ii] λλ6716, 6731/Hα = 0.64 ± 0.03 in the cloud. This giant cloud of material could be lifted from M82 by tidal interactions or by its powerful starburst. Alternatively, it may be gas infalling from the cosmic web, potentially precipitated by the superwinds of M82. Deeper data are needed to test these ideas further. The upcoming Dragonfly Spectral Line Mapper will have 120 lenses, 40× more than in the pathfinder instrument used to obtain the data presented here.
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Tian Xiaohang, 田晓航, and 薛常喜 Xue Changxi. "小F数红外双波段无热化折衍摄远物镜设计." Acta Optica Sinica 42, no. 14 (2022): 1422002. http://dx.doi.org/10.3788/aos202242.1422002.

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Whiting, Paul R., and Gregory L. W. Robinson. "Using Irlen Coloured Lenses for Reading: A Clinical Study." Australian Educational and Developmental Psychologist 5, no. 2 (November 1988): 7–10. http://dx.doi.org/10.1017/s0816512200025888.

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ABSTRACTSome recent evidence from both clinical and empirical studies has suggested that some cases of reading disability might be helped by the use of Irlen tinted lenses. Clinical work has been carried out in two special education centres, at Sydney CAE and at Hunter Institute of Higher Education. Four hundred and sixty five clients from these centres, all of whom had reading problems, and who had worn Irlen lenses fora minimum of 12 months were surveyed to assess their evaluation of the usefulness of the lenses for a variety of literacy-related difficulties. Ninety three percent indicated a definite improvement in these difficulties. Largest improvements were reported in amount of effort required to read, fluency of reading, concentration, and comprehension. In each factorsurveyed, more than 50% of respondents indicated definite improvements, including handwriting, spelling, tiredness, and self-confidence. Telephone checks with non-respondents indicated that the results are probably reliable for the whole of the population surveyed.
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Dissertations / Theses on the topic "Telephoto lenses"

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Gao, Weichuan, and Jose Sasian. "Air lens vs aspheric surface: a lens design case study." SPIE-INT SOC OPTICAL ENGINEERING, 2017. http://hdl.handle.net/10150/627181.

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We discuss the behavior of air lenses in lens design. The structural aberration coefficients of a thin air lens are derived and compared with their glass thin lens counterpart. Examples are provided for a telephoto lens and the Monochromatic Quartet where air lenses or aspheric surfaces are used.
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Books on the topic "Telephoto lenses"

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Sheppard, Rob. Telephoto lens photography. Buffalo: Amherst Media, 1997.

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Telephoto lens photography. Buffalo: Amherst Media, 1997.

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Seymour, Nicole. Post-Transsexual Pastoral. University of Illinois Press, 2017. http://dx.doi.org/10.5406/illinois/9780252037627.003.0002.

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This chapter offers a definitive example of ecological thinking in contemporary queer fictions. It reads American author Leslie Feinberg's Stone Butch Blues (1992) alongside two narratives set in the Caribbean: Jamaican American Michelle Cliff's No Telephone to Heaven (1987) and Trinidadian Canadian Shani Mootoo's Cereus Blooms at Night (1998). These novels depict what an “organic transgenderism:” a spontaneous, noncommodified, and self-directed process likened to the life-cycle changes of plants and animals. The chapter claims that they thereby challenge the common view of gender transitioning as an “unnatural” medical intervention. Moreover, through their depictions of organic transgenderism, these novels stage, and thus help facilitate, a shift in the 1990s from the older sexological model of “transsexuality” to the current community-derived umbrella term of “transgenderism.” Finally, this chapter demonstrates how a queer ecocritical lens can help us trace the transnational circulation of queer ecological thinking.
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Ma, Shaoling. The Stone and the Wireless. Duke University Press, 2021. http://dx.doi.org/10.1215/9781478013051.

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In the final decades of the Manchu Qing dynasty in China, technologies such as the phonograph, telephone, telegraph, and photography were both new and foreign. In The Stone and the Wireless Shaoling Ma analyzes diplomatic diaries, early science fiction, feminist poetry, photography, telegrams, and other archival texts, and shows how writers, intellectuals, reformers, and revolutionaries theorized what media does despite lacking a vocabulary to do so. Media defines the dynamics between technologies and their social or cultural forms, between devices or communicative processes and their representations in texts and images. More than simply reexamining late Qing China's political upheavals and modernizing energies through the lens of media, Ma shows that a new culture of mediation was helping to shape the very distinctions between politics, gender dynamics, economics, and science and technology. Ma contends that mediation lies not only at the heart of Chinese media history but of media history writ large.
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Book chapters on the topic "Telephoto lenses"

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Fischer, Daniel, and Hilmar Duerbeck. "Gravitational Lenses: Hubble’s Telephoto Lens." In Hubble Revisited, 82–87. New York, NY: Springer New York, 1998. http://dx.doi.org/10.1007/978-1-4612-2232-3_13.

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Pajala, Mari. "Creating Information Infrastructure for Transnational Co-operation in Television: Nordvision in the 1960s–1970s." In Nordic Media Histories of Propaganda and Persuasion, 205–23. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-05171-5_10.

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AbstractNordic public service television organizations launched Nordvision in 1959 to organize television programme exchange and co-productions, and the network remains active today. This chapter concentrates on a period at the turn of the 1960s and 1970s when Nordvision reorganized its working practices, to trace how Nordvision developed information infrastructure that would support transnational collaboration in television. A key problem for Nordvision was how to ensure the efficient exchange of information necessary for transnational co-operation. This chapter discusses Nordvision’s efforts to develop its information infrastructure consisting of an active meeting culture, paper documents and media technologies such as telephone and video, to understand how Nordvision defined challenges relating to Nordic co-operation and attempted to solve them. Through this lens, this chapter considers how television has contributed to constructing the Nordic region, not by analysing how Nordicness was represented on television screens, but by focusing on the behind-the-scenes work of developing Nordic co-operation networks.
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Barnett, Shawn. "Telephoto Lenses." In Sony A200, 131–33. Elsevier, 2008. http://dx.doi.org/10.1016/b978-0-240-81110-9.50019-x.

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Laikin, Milton. "Telephoto Lenses." In Lens Design, 87–97. CRC Press, 2018. http://dx.doi.org/10.1201/9780849382796-7.

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"Telephoto Lenses." In Optical Science and Engineering, 87–97. CRC Press, 2006. http://dx.doi.org/10.1201/9780849382796.ch7.

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"Telephoto Lenses." In Sony A300/A350, 143–46. Routledge, 2012. http://dx.doi.org/10.4324/9780080879093-27.

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"Telephoto Lenses." In Nikon D60, 231. Routledge, 2012. http://dx.doi.org/10.4324/9780080888231-29.

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"Telephoto Lenses." In Sony A200, 127–29. Routledge, 2013. http://dx.doi.org/10.4324/9780080888248-26.

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"Super Telephoto Lenses." In Nikon D60, 232. Routledge, 2012. http://dx.doi.org/10.4324/9780080888231-30.

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Ray, Sidney F. "Telephoto and stabilized lenses." In Applied Photographic Optics, 302–9. Routledge, 2002. http://dx.doi.org/10.4324/9780080499253-30.

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Conference papers on the topic "Telephoto lenses"

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Weiner, David. "Telephoto attachments for telecentric lenses." In SPIE's 1995 International Symposium on Optical Science, Engineering, and Instrumentation, edited by Jose M. Sasian. SPIE, 1995. http://dx.doi.org/10.1117/12.216402.

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Yamashita, Masashi. "Design of telephoto zoom lens with built-in teleconverter for digital still cameras." In Zoom Lenses VI, edited by Takanori Yamanashi and Aurelian Dodoc. SPIE, 2019. http://dx.doi.org/10.1117/12.2529043.

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Masumoto, Hisayuki. "Development of zoom lenses for camera and Technical topics.: Design examples ,Analysis ,Optical design method ,Aspherical lenses ,and Manufacturing." In International Optical Design Conference. Washington, D.C.: Optica Publishing Group, 1998. http://dx.doi.org/10.1364/iodc.1998.ltua.1.

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The presentation focuses on the recent evolution of camera zoom lenses. The history covers standard and telephoto SLR zoom lenses and LS zooms. Actual design examples and the new design technologies that achieved the development will also be presented.
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Chen, Yu, Furong Huo, and Liqin Zheng. "Infrared telephoto lenses design for joint transform correlator." In International Symposium on Optoelectronic Technology and Application 2014, edited by Jannick P. Rolland, Changxiang Yan, Dae Wook Kim, Wenli Ma, and Ligong Zheng. SPIE, 2014. http://dx.doi.org/10.1117/12.2072497.

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Zhang, Yu, Ji-yang Shang, Zheng Li, and Wen-sheng Wang. "Design of infrared telephoto lenses for joint transform correlator." In International Symposium on Photoelectronic Detection and Imaging 2011. SPIE, 2011. http://dx.doi.org/10.1117/12.900777.

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Koester, Charles J., and Anthony Donn. "Optics of the ocular telephoto system for patients with macular degeneration." In OSA Annual Meeting. Washington, D.C.: Optica Publishing Group, 1985. http://dx.doi.org/10.1364/oam.1985.fi5.

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Magnifications of 2-4× can be achieved by utilizing a strong negative intraocular lens together with a positive spectacle lens.1 The advantage of this system over conventional telescopic low-vision aids is that for a given magnification the ocular telephoto system provides a significantly larger field of view. For near tasks such as reading, the system can provide greater magnification at a given working distance than can simple magnifiers or magnifying spectacle lenses. Potential problems are discussed, including IOL decentration and patient disorientation due to disparate magnifications in the two eyes. The magnification or the field of view can be simulated before surgery by using a strong negative contact lens together with a positive spectacle lens. The type of patient most likely to be helped by the ocular telephoto system has stable macular disease, substantially reduced visual acuity, difficulty utilizing conventional low-vision aids, and a strong desire to perform near tasks such as reading or computer terminal work.
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Kreitzer, M. H., and J. Moskovich. "The Design Of Large Ratio Wide Angle To Telephoto Zean Lenses For 35mm Photography." In 1985 International Lens Design Conference, edited by Duncan T. Moore and William H. Taylor. SPIE, 1986. http://dx.doi.org/10.1117/12.949265.

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Ford, Joseph E., and Eric J. Tremblay. "Achieving tolerances in an intolerant world: telephoto contact lenses and other unconventional imaging systems." In SPIE Optical Engineering + Applications, edited by José Sasián and Richard N. Youngworth. SPIE, 2011. http://dx.doi.org/10.1117/12.897313.

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Aldrich, Robert E. "Commercial two- and three-element infrared wide-field-of-view 100% coldshielded inverse telephoto lenses." In SPIE's 1995 International Symposium on Optical Science, Engineering, and Instrumentation, edited by Robert E. Fischer and Warren J. Smith. SPIE, 1995. http://dx.doi.org/10.1117/12.219520.

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Fantone, Stephen D. "Design considerations for an amateur camera viewfinder." In OSA Annual Meeting. Washington, D.C.: Optica Publishing Group, 1987. http://dx.doi.org/10.1364/oam.1987.tuz2.

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The Polaroid Spectra camera contains an unusual telescopic viewfinder comprised of injection-molded components and glass mirrors. The camera’s geometry required a radical departure from the reversed Galilean form typically found in inexpensive cameras. The result is a viewfinder which is over 150 mm in length, has an eye relief of 17 mm, and a magnification of 0.5, covers a full field in excess of 54°, and yet presents a cross section at the front of the camera of <18 × 12 mm. The Spectra's reverse telephoto design includes seven lenses, five aspheric surfaces, and two prisms as well as a four-mirror erecting system. High-volume manufacturing techniques required a design which allows for automated assembly and testing.
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