Patent
Large relative aperture objective lens
Masatake Kato,Shigeru Hashimoto +1 more
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TLDR
In this paper, an objective lens of large relative aperture includes three lens components of positive power arranged to be focused by moving the first and third components in unison forwardly, along with forward movement of the second component by a smaller amount than the movement of first and second components when focusing down to shorter object distances.Abstract:
An objective lens of large relative aperture includes three lens components of positive power arranged to be focused by moving the first and third components in unison forwardly, along with forward movement of the second component by a smaller amount than the movement of the first and third components when focusing down to shorter object distances. Accordingly, aberrations are well corrected throughout an extended range of image magnification.read more
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