Inner Focusing Lens

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Abstract

The article describes the design of inner focusing lenses. Lenses can be used in surveillance devices, night vision devices, for application in machine vision systems, in photography and other fields. Wide-angle lens with a focal length of 16 mm and an aperture of F / 1.8, fast lens with a focal length of 26 mm and an aperture of F / 1.2, lens with a focal length of 50 mm and an aperture of F / 1.4, lens with a focal length of 100 mm and an aperture of F / 2.8, telephoto lens with a focal length of 200 mm and an aperture of F / 4, as well as for comparison a lens with a variable focal length of 10–300 mm and an aperture of F / 1.6–4.5.

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About the authors

Igor P. Shishkin

NTC “LEMT” BeloMO

Author for correspondence.
Email: shipoflens@mail.ru
ORCID iD: 0000-0002-4592-1060

Cand. of Tech. Sciences

Belarus, Minsk

Alexey P. Shkadarevich

NTC “LEMT” BeloMO

Email: shipoflens@mail.ru

Dr. of Tech. Sciences

Belarus, Minsk

References

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  5. WO Patent 2015106908., 2015.07.23. Photographic lens. / Wang L., Shyshkin I.
  6. US Patent 2014347743, 2014.11.27. Photographic wide angle lens system with internal focusing / Wang L., Shyshkin I.
  7. Park S. C., Lee W. S. Paraxial design method based on an analytic calculation and its application to a three-group inner-focus zoom system. J. Korean Phys. Soc. 2014;64:1671–1676.
  8. US Patent 8503096, 2013.08.06. Inner focus lens, interchangeable lens apparatus and camera system /Imaoka T., Hoshi K., Hagimori H.
  9. US Patent 2005/0248857, 2005.11.10. Large aperture ratio internal focusing telephoto lens / Wada M.

Supplementary files

Supplementary Files
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2. Fig. 1. f` = 16 mm lens: а – Layout; b – MTF

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3. Fig. 2. f` = 26 mm lens: а – Layout; b – MTF

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4. Fig. 3. F`=50 mm lens: а – Layout; b – MTF

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5. Fig. 4. f` = 100 mm lens: а – Layout; b – MTF

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6. Fig. 5. f` = 200 mm telephoto lens: a – Layout; b – MTF for λ = 0.4–0.7 µm

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7. Fig. 6. f` = 200 mm telephoto lens: a – MTF for λ = 0.4–0.9 µm, b – MTF for λ = 0.4–1.6 µm

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8. Fig. 7. Zoom lens f` = 10–300 mm: a – layout at position f` = 10mm; b – layout at position f` = 300 mm

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9. Fig. 8. Zoom lens f` = 10–300 mm: a – MTF at position f` = 10 mm; b – MTF at position f' = 300 mm

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Copyright (c) 2025 Shishkin I.P., Shkadarevich A.P.