Evaluation of a corrected cam for an interchangeable lens with a distance window

Jin Woo Kim, Jae Myung Ryu, Jae Heung Jo, Young-Joo Kim

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Recently, the number of camera companies that produce commercializing interchangeable lens systems such as digital single lens reflex (DSLR) and compact system camera (CSC) lenses has been gradually increasing. These interchangeable lenses have various kinds of lenses with distinct specifications. In particular, the distance window among these specifications is the function most preferred by customers. Mechanical manual zoom and manual focus in these high end camera lenses with a distance window are in particular desirable specifications and are required for product quality. However, the AF lens group is linked to the zoom cam and moves. Because the AF lens group moves along with the object distance, we can not realize the distance window with only zoom locus calculation. In this paper, in order to solve the problem, we suggest an optical calculation method for a corrected AF zoom cam for an interchangeable lens with a distance window to achieve product differentiation and analyze the error in the calculation.

Original languageEnglish
Pages (from-to)23-31
Number of pages9
JournalJournal of the Optical Society of Korea
Volume18
Issue number1
DOIs
Publication statusPublished - 2014 Jan 1

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cams
lenses
evaluation
specifications
cameras
reflexes
loci
products

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics

Cite this

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abstract = "Recently, the number of camera companies that produce commercializing interchangeable lens systems such as digital single lens reflex (DSLR) and compact system camera (CSC) lenses has been gradually increasing. These interchangeable lenses have various kinds of lenses with distinct specifications. In particular, the distance window among these specifications is the function most preferred by customers. Mechanical manual zoom and manual focus in these high end camera lenses with a distance window are in particular desirable specifications and are required for product quality. However, the AF lens group is linked to the zoom cam and moves. Because the AF lens group moves along with the object distance, we can not realize the distance window with only zoom locus calculation. In this paper, in order to solve the problem, we suggest an optical calculation method for a corrected AF zoom cam for an interchangeable lens with a distance window to achieve product differentiation and analyze the error in the calculation.",
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Evaluation of a corrected cam for an interchangeable lens with a distance window. / Kim, Jin Woo; Ryu, Jae Myung; Jo, Jae Heung; Kim, Young-Joo.

In: Journal of the Optical Society of Korea, Vol. 18, No. 1, 01.01.2014, p. 23-31.

Research output: Contribution to journalArticle

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