Solutions on a high-speed wide-angle zoom lens with aspheric surfaces

2012 ◽  
Author(s):  
Takanori Yamanashi
Keyword(s):  
High Speed ◽  
Zoom Lens ◽  
Wide Angle ◽  
Aspheric Surfaces

scholarly journals Design of Wide Angle and Large Aperture Optical System with Inner Focus for Compact System Camera Applications

2019 ◽  
Vol 10 (1) ◽  
pp. 179 ◽  
Author(s):  
Hojong Choi ◽  
Jaemyung Ryu
Keyword(s):  
Optical System ◽  
High Speed ◽  
Resolving Power ◽  
Wide Angle ◽  
Phase Detection ◽  
Half Angle ◽  
Stepper Motors ◽  
Angle Of View ◽  
Floating Type ◽  
Focusing Lens

Conventionally, a bright, very wide-angle optical system is designed as a floating type optical system that moves two or more lens groups composed of multiple lens in order to focus accurately. These have been widely used as phase detection auto focus (AF) methods within conventional digital single-lens reflex (DSLR) cameras. However, a phase detection AF optical system cannot be used when recording motion pictures. In contrast, a compact system camera (CSC) performs AF by the contrast method, where a stepper motor is used as the driving source for moving the optical lens. Nonetheless, to ensure that the focusing lens is lighter, these stepper motors should not have high torque and AF must be possible by moving only one lens. Yet, when focusing is performed with only one lens, aberration change due to focusing lens movement is magnified. Therefore, a very wide-angle optical system comprised of a half-angle of view more than 40 degrees and F of 1/4 has not been developed. Here, a very wide-angle optical system was designed with high resolving power that enables high speed AF, even in contrast mode, by moving only one lens while minimizing aberration change.

Automatic Distortion Correction of Endoscopic Images Captured With Wide-Angle Zoom Lens

2013 ◽  
Vol 60 (9) ◽  
pp. 2603-2613 ◽  
Author(s):  
Tung-Ying Lee ◽  
Tzu-Shan Chang ◽  
Chen-Hao Wei ◽  
Shang-Hong Lai ◽  
Kai-Che Liu ◽  
...  
Keyword(s):  
Distortion Correction ◽  
Zoom Lens ◽  
Wide Angle ◽  
Endoscopic Images

Development of high-speed and wide-angle visible observation diagnostics on Experimental Advanced Superconducting Tokamak using catadioptric optics

2013 ◽  
Vol 84 (8) ◽  
pp. 085102 ◽  
Author(s):  
J. H. Yang ◽  
X. F. Yang ◽  
L. Q. Hu ◽  
Q. Zang ◽  
X. F. Han ◽  
...  
Keyword(s):  
High Speed ◽  
Wide Angle ◽  
Superconducting Tokamak

High Speed Lapping Ellipsoid by Means of a Lapping Tool Bending Method

2007 ◽  
Vol 329 ◽  
pp. 309-314 ◽  
Author(s):  
J.D. Yang ◽  
Q. Liu ◽  
C.L. Tian ◽  
J.W. Guo ◽  
Y.H. Feng
Keyword(s):  
High Speed ◽  
Bending Moment ◽  
Light Energy ◽  
System Structure ◽  
Aspheric Surfaces ◽  
Ellipsoid Method ◽  
Aspheric Optics ◽  
Lapping Machine ◽  
Reduced Light

This paper discusses a new lapping ellipsoid method, which combines high-speed lapping technology with solid abrasives and lapping tool bending method. In this method, a bending moment is acted on lapping tool with solid abrasives, which makes it bend to form a shape on its working surface, which is the same as generant of workpiece shape. This kind tool is used in forming lapping on a high speed lapping machine. With the development of science and technology, the requirements for optics systems become higher and higher, e.g. good quality of imaging, little loss light energy, small size and light weight etc. It is difficult to reach above requirements by using traditional sphere lens/mirrors in optics systems. Aspheric optics elements can be used to solve these problems. In optics systems, by using aspheric optics elements, the number of optics elements can be reduced, the system structure can be simplified, the weight and size of the system can be reduced, light energy loss can be reduced too, imaging errors can be avoided and imaging quality can be improved. Ellipsoid is a kind of surface being used widely within all kinds of aspheric surfaces. The main purpose of this paper is to introduce a method of lapping this kind of surface at high speed.

Mt. Dushak-Erekdag Observatory: A Chance to Close the Asian Gaps in WET Coverage

2003 ◽  
Vol 12 (2) ◽  
Author(s):  
T. N. Dorokhova ◽  
N. I. Dorokhov
Keyword(s):  
Soviet Union ◽  
Central Asia ◽  
Former Soviet Union ◽  
High Speed ◽  
Astronomical Observatory ◽  
Light Pollution ◽  
Wide Angle ◽  
International Programs ◽  
Low Light ◽  
Stable Economy

AbstractThe Mt. Dushak-Erekdag Observatory (Central Asia, Turkmenistan, 58° E longitude) is located just in the longitudes gap of asteroseismological networks. It is the southernmost observatory of the former Soviet Union, its latitude is +38°. The sky seeing at the site is one of the best in Central Asia: a low light pollution, high and stable sky transparency, over 200 usable nights per year. The altitude is above 2000 m.Odessa Astronomical Observatory has its 0.8 m telescope with a two-star high-speed photometer there, which frequently participates in international programs and multi-site campaigns. An accuracy of the photometry amounts to 1 mmag. Besides, a 1 m wide-angle telescope and a dual-tube telescope with 0.5m mirrors are installed at the observatory.The developed infrastructure at the site and the stable economy in Turkmenistan make the Mt. Dushak-Erekdag Observatory very interesting for the WET observations.

Filament identification in wide-angle high speed imaging of the mega amp spherical tokamak

2019 ◽  
Vol 90 (9) ◽  
pp. 093502
Author(s):  
T. Farley ◽  
N. R. Walkden ◽  
F. Militello ◽  
M. Sanna ◽  
J. Young ◽  
...  
Keyword(s):  
High Speed ◽  
Spherical Tokamak ◽  
Wide Angle ◽  
High Speed Imaging
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