Browse > Article
http://dx.doi.org/10.3807/JOSK.2015.19.6.629

Optical Design and Fabrication of a Large Telephoto Zoom Lens with Fixed f/2.8 and Light Autofocus Lens  

Ryu, Jae Myung (Department of Optical Engineering, Kumoh National Institute of Technology)
Gang, Geon Mo (R&D Team, Digital Imaging Business, Samsung Electornics Co., Ltd.)
Lee, Hyuck Ki (R&D Team, Digital Imaging Business, Samsung Electornics Co., Ltd.)
Lee, Ki Woo (R&D Team, Digital Imaging Business, Samsung Electornics Co., Ltd.)
Heu, Min (R&D Team, Digital Imaging Business, Samsung Electornics Co., Ltd.)
Jo, Jae Heung (Department of Optics and Sensors, Hannam University)
Publication Information
Journal of the Optical Society of Korea / v.19, no.6, 2015 , pp. 629-637 More about this Journal
Abstract
Compact system cameras (CSCs) are commonly used nowadays and feature enhanced video functions and thin yet light interchangeable lenses. They differ from digital single-lens reflex (DSLR) cameras in their lack of mirror boxes. CSCs, however, have autofocus (AF) speeds lower than those of conventional DSLRs, requiring weight reduction of their AF groups. To ensure the marketability of large telephoto zoom lenses with fixed f/2.8 regardless of field angle variation, in particular, light weight AF groups are essential. In this paper, we introduce a paraxial optical design method and present a new, large, telephoto zoom lens with f/2.8 regardless of the field angle variation, plus a lightweight AF group consisting of only one lens. Using the basic paraxial optical design and optimization methods, we fabricated a new and lighter zoom lens system, including a single-lens, lightweight AF group with almost the same performance.
Keywords
Lens design; Zoom lens; Zoom locus;
Citations & Related Records
Times Cited By KSCI : 3  (Citation Analysis)
연도 인용수 순위
1 Sigma Corp., “APO 70-200mm F2.8 EX DG OS HSM,” (Sigma Corp., 2013), http://www.sigmaphoto.com/product/apo-70-200mm-f28-ex-dg-os-hsm
2 K. Tomoki, "Large-aperture telephoto zoom lens with vibrationproof function," JP2011-158599, Japanese ed. (2011).
3 Samsung Elec. Co., "SAMSUNG 50-150mm f2.8 S ED OIS," (Korean ed., Samsung Elec. Co., Ltd., 2013), http://smartdevice.kr/619
4 J. Reilly, "Canon EOS DSLR autofocus explained," (TheDigital-Picture.com, 2014), http://www.the-digital-picture.com/Photography-Tips/canon-eos-dslr-autofocus-explained.aspx
5 J. M. Ryu, J. H. Jo, G. M. Kang, H. J. Lee, and S. Yoneyama, “Focus adjustment method with statistical analysis for an interchangeable zoom lens with symmetric error factors,” Korean J. Opt. Photon. (Hankook Kwanghak Hoeji) 22, 230-238 (2011).   DOI
6 Camera Lens Hyaka, Encyclopedia, 1st ed. (Shashin Kogyo Shoppan Co., Ltd., 2001, Japanese ed.), Chapter 76.
7 Photoscala, “The camera market 2014,” German ed., Photoscala, 2014, http://www.photoscala.de/Artikel/Zahlen-und-Prognosen-Der-Kameramarkt-2014
8 J. H. Oh, J. M. Ryu, and J. H. Jo, “Analytic calculation method of zoom loci for zoom lens system with infinite object distance,” Korean J. Opt. Photon. (Hankook Kwanghak Hoeji) 24, 125-134 (2013).   DOI
9 M. Herzberger, Modern Geometrical Optics (Interscience Publisher, New York, USA, 1958), Chapter 9.
10 J. U. Lee and S. C. Park, “Generalized lens group conversion to their equivalent lenses,” Korean J. Opt. Photon. (Hankook Kwanghak Hoeji) 9, 251-257 (1998).
11 S. C. Park and Y. S. Kim, “Optical system design using lens modules I: optimum first order design in zoom lens,” Korean J. Opt. Photon. (Hankook Kwanghak Hoeji) 8, 81-87 (1997).
12 J. W. Kim, J. M. Ryu, J. H. Jo, and Y. J. Kim, “Evaluation of a corrected cam for an interchangeable lens with a distance window,” J. Opt. Soc. Korea 18, 23-31 (2014).   DOI
13 J. Ryu, “Telesphoto zoom lens,” KR2010-0018341, Korean ed. (2008).
14 J. H. Jung, “Paraxial design and locus analysis of zoom lens system,” Dissertation of Ph. D. Degree, Kyungnam University (1994).
15 Tamron Corp., “SP AF70-200mm F2.8 Di LD [IF. MACRO,” (Tamron Co., Ltd., 2013), http://www.tamron.co.jp/lineup/a001/structure.html
16 Nikon Corp., “AF-S NIKKOR 70-200mm f/2.8G ED VR II,” (Nikon Corp, 2013), http://www.nikon-image.com/products/lens/nikkor/af-s_nikkor_70-200mm_f28g_ed_vr_2/
17 Fujifilm Corp., “Fujinon lens XF50-140mmF2.8 R LM OIS WR,” (Fujifilm Co., Ltd., 2014), http://www.fujifilm.com/products/digital_cameras/x/fujinon_lens_xf50_140mmf28_r_lm_ois_wr/
18 I. Tomoki, "Variable power optical system, optical device including the variable power optical system and method of manufacturing variable power optical system," JP2010-191334 Japanese ed. (2010).
19 “Code V,” is a registered trademark of SYNOPSYS, http://www.opticalres.com/