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지택상(Taek Sang Ji),임현선(Hyeon Seon Lim),박성혜(Sung Hye Park) 한국안광학회 1998 한국안광학회지 Vol.3 No.1
We investigated the optical properties of 3-component zoom camera lens whose character is being compact and having wide angle. Also, we calculated paraxial design condition and locus of each component by using Gaussian Bracket.
지택상(Taek Sang Ji),임현선(Hyeon Seon Lim),김봉환(Bong Hwan Kim) 한국안광학회 2000 한국안광학회지 Vol.5 No.2
We analyzed to calculate optical capacity after we chose established 2 component zoom copier lens system in this research. As the lens system is zoom lens system of finite object point, it has moving area limited not like to use generally camera zoom lens of infinite object point because it moves between object and image plane. The magnification of optical system can obtain -1.41 -0.64 i.e., extended or shortened image as transverse magnification, and it acquires f/12 and about 20 field of view. Although this 2 component zoom copier lens system will be down resolution and dark compared with f/2.8 acquired at camera lens. it will be possibile to be able to make large aperture and it can acquire more better correct aberration with the addition of auxiliary group forward or backward.
CONTACT LENS ANALYZER CA - 20 의 광학계 성능 조사
지택상(Taek Sang Ji),임현선(Hyeon Seon Lim),김봉환(Bong Hwan Kim) 한국안광학회 2000 한국안광학회지 Vol.5 No.1
Magnification shall large to test a surface of a contact lens also chromatic aberration and distortion to be removed. Be used of this study a contact lens analyzer is $quot;CONTACT LENS ANALYZER CA-20$quot;, it is a good analyzer to suitable with surface test 16 times of big magnification and distortion.
35mm 카메라 비구면 줌 렌즈계의 광학적 성능을 통한 비구면 분석
지택상(Taek Sang Ji),임현선(Hyeon Seon Lim),김봉환(Bong Hwan Kim) 한국안광학회 2001 한국안광학회지 Vol.6 No.1
We analyzed aspheric patterns after we investigated zoom lens` constructions and optical capacities of a ordinary designed 35 ㎜ camera with an aspheric zoom lens system in this research. As this lens system was the zoom lens system about infinite object point, it was made to get a short back focal length. be able to use a lens unit more close to the image plane, and be used the compact camera which got a viewing system. The zoom ratio of the system was 1 : 2 and it got a positive and negative power`s distribution. As it was determined the 35∼70 ㎜ focal length range which the most common people used, it might be called economic optical system considered universality. As it was used two aspheric surface, it was used just three lens, compensated the aberration and schemed lens` miniaturization, lightweightization, and the decrease effect of the unit cost of production.
지택상(Taek Sang Ji),임현선(Hyeon Seon Lim),박성혜(Sung Hye Park) 한국안광학회 1997 한국안광학회지 Vol.2 No.1
We chose four types of Huygenian, Ramsden, Kellner, Erfle, among the eyepieces frequently used for optical instruments. Then we calculate their optical properties and investigated characters of each type by comparing them.
임현선(Hyeon Seon Lim),지택상(Taek Sang Ji),김봉환(Bong Hwan Kim) 한국안광학회 2000 한국안광학회지 Vol.5 No.1
The rate of transmittance of the sunglasses sold at home is shown in this paper. Most of the lens treated with sunglasses turned out to be 0% in the range of the UV, but those made by some company to be 18%.