Topic
Apochromat
About: Apochromat is a research topic. Over the lifetime, 642 publications have been published within this topic receiving 7934 citations.
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TL;DR: In this paper, a method for the design of zoom lenses using the third order aberration theory is described, which makes it possible to determine, which elements of the optical system can be only simple lenses and which elements must have more complicated design, e.g. doublets or triplets.
Abstract: Optical systems with variable optical characteristics (zoom lenses) find broader applications in practice nowadays and methods for their design are constantly developed and improved. Our work describes a methodics of the design of zoom lenses using the third order aberration theory. The proposed method makes possible to determine, which elements of the optical system can be only simple lenses and which elements must have more complicated design, e.g. doublets or triplets. It is also shown the method for optical system design that permits to calculate the radii of curvature and optical glass types for individual lenses.
2 citations
Patent•
05 Feb 2014
TL;DR: In this article, the apochromatic large objective lens with long working distance for an operating microscope was proposed, where the working distance reached 285mm and the resolution ratio was high, an image was clear, and color anamorphose is small.
Abstract: The invention belongs to the technical field of operating microscope optical systems and relates to an apochromatic large objective lens with long working distance for an operating microscope. According to the apochromatic large objective lens with the long working distance for the operating microscope, when focal length is 250mm, the working distance can reach 285mm, replacement of a large objective lens with a large focal length is avoided, hospital cross infection caused by replacement of the large objective lens in the process of minimally invasive surgeries can be removed, and meanwhile a secondary spectrum is corrected by utilizing anomalous dispersion glass. The shortcoming that the working distance of a large objective lens of a traditionally designed operating microscope is overcome, the secondary spectrum is corrected, the resolution ratio is high, an image is clear, and color anamorphose is small. An experiment shows that tissue details of 10 microns can be seen clearly by utilizing the operating microscope comprising the apochromatic large objective lens during the minimally invasive surgeries.
2 citations
Journal Article•
TL;DR: In this article, subjective contrast sensitivity and resolution measurements were performed in the presence of various amounts of chromatic aberration, resulting from using a powered holographic mirror with a narrow band non-laser source for reconstruction.
2 citations
Patent•
06 Jul 2011
TL;DR: In this article, a CaF2-free low-power plan apochromatic metallographic microscope is characterized by consisting of three lenses, i.e., a first positive lens, a second negative lens and a third positive lens which are coaxial and are sequentially arranged from left to right as follows.
Abstract: The utility model provides a CaF2-free low-power plan apochromatic metallographic microscope, comprising lenses. The CaF2-free low-power plan apochromatic metallographic microscope is characterized by consisting of three lenses, i.e. a first positive lens, a second negative lens and a third positive lens which are coaxial and are sequentially arranged from left to right as follows: the first positive lens->the second negative lens->the third positive lens>an object plane, and the object plane->the third positive lens->the second negative lens->the first positive lens; and the formed image is at an infinite position. The CaF2-free low-power plan apochromatic metallographic microscope has the advantages that: 1, the CaF2-free low-power plan apochromatic metallographic microscope achieves the plan apochromatic effect; 2, the working distance is long; 3, the cost performance is high; and 4, the structure is simple.
2 citations
01 Jan 1943
2 citations