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Patents related to photographic lenses

Dibyendu
March 30, 2023
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    Dibyendu
    Members 139 posts
    March 30, 2023, 7:53 p.m. March 30, 2023, 7:53 p.m.
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    This is a continuation of the series started at DPreview.com.

    I will copy across all the messages from there so that we do not lose information if DPreview.com forums get deleted. But here are the original threads:

    www.dpreview.com/forums/post/66804601 - Part 8

    www.dpreview.com/forums/post/66553339 - Part 7

    www.dpreview.com/forums/post/66387822 - Part 6

    www.dpreview.com/forums/post/65906028 - Part 5

    www.dpreview.com/forums/post/65600385 - Part 4

    www.dpreview.com/forums/post/65291223 - Part 3

    www.dpreview.com/forums/post/64825009 - Part 2

    www.dpreview.com/forums/post/63870069 - Part 1

    pwilly, xlucine, JohnVickers and 2 other users like this.

    favorite 5

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    Dibyendu
    Members 139 posts
    March 31, 2023, 7:11 a.m. March 31, 2023, 7:11 a.m.
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    The Optical Bench Hub maintained by Bill Claff at Photons to Photos is the largest database of patents that can be matched to an actual production photographic lens.

    I also maintain a subset of Nikon related patents list at Nikon Nikkor Lens Patent Database. My goal is to find the best match for a production lens, that may or may not be an exact match.

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    Dibyendu
    Members 139 posts
    March 31, 2023, 7:16 a.m. March 31, 2023, 7:16 a.m.
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    The lens patent data can be used to analyze the lens theoretical performance. For instance, using the open source ray-optics package maintained by Michael Hayford, following is a Jupyter Notebook that looks at the Canon 50mm RF f1.2 lens.

    Canon 50mm RF f1.2

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    Dibyendu
    Members 139 posts
    March 31, 2023, 7:30 a.m. March 31, 2023, 7:30 a.m.
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    Patents also reveal who is behind a particular lens design.
    Many modern Leica, Zeiss branded lenses are actually designed by Japanese firms!
    Nikon collaborates with other companies too!

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    Dibyendu
    Members 139 posts
    March 31, 2023, 6:42 p.m. March 31, 2023, 6:42 p.m.
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    I intend to copy across the lenses that are not covered by Bill Claff, to start with. The ones already covered by Bill in his database, can be found at The Optical Bench Hub.

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    Dibyendu
    Members 139 posts
    March 31, 2023, 6:51 p.m. March 31, 2023, 6:51 p.m.
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    The Sigma 40mm f1.4 ART lens is one of the most elaborately designed lenses for a prime.
    It is a Zeiss Otus class lens at a fraction of the price. Its design incorporates 3 fluorite class Super ED glass elements, and three ED glass elements. Although not branded APO it is very much an apo-chromatic design.

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    Patent JP2018134615A - 2018.

    Using patent data:

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    More detailed analysis from patent data using Michael Hayford's ray-optics.

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    PNG, 77.9 KB, uploaded by Dibyendu on March 31, 2023.

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    PNG, 82.8 KB, uploaded by Dibyendu on March 31, 2023.

    xlucine and XRay like this.

    favorite 2

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    Dibyendu
    Members 139 posts
    March 31, 2023, 9 p.m. March 31, 2023, 9 p.m.
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    Nikkor Z 20mm f1.8S

    This is an example where the patent is the best rather than exact match for the production lens.

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    The patent is WO2021117429A1.

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    PNG, 57.0 KB, uploaded by Dibyendu on March 31, 2023.

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    PNG, 90.9 KB, uploaded by Dibyendu on March 31, 2023.

    xlucine likes this.

    favorite 1

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    Dibyendu
    Members 139 posts
    April 1, 2023, 9:49 a.m. April 1, 2023, 9:49 a.m.
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    Cosina Voigtlander SL Macro Apo Lanthar 125 mm f/2.5

    This lens has legendary status amongst many photographers.

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    The related patent is JP2002090622A, designer Yoshihisa Yomogida, 2000.

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    PNG, 34.8 KB, uploaded by Dibyendu on April 1, 2023.

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    PNG, 955.0 KB, uploaded by Dibyendu on April 1, 2023.

    xlucine likes this.

    favorite 1

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    Dibyendu
    Members 139 posts
    April 1, 2023, 9:58 a.m. April 1, 2023, 9:58 a.m.
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    Cosina Voigtlander Apo-Lanthar 180mm f4

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    Patent JP2003270529A, also by YOMOGIDA YOSHIHISA, 2003.

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    PNG, 40.3 KB, uploaded by Dibyendu on April 1, 2023.

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    PNG, 431.9 KB, uploaded by Dibyendu on April 1, 2023.

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    Dibyendu
    Members 139 posts
    April 1, 2023, 10:24 a.m. April 1, 2023, 10:24 a.m.
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    Cosina Voigtlander 50mm f2 Apo-Lanthar

    Related patent JP-2021-043376.

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    From the patent

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    PNG, 383.4 KB, uploaded by Dibyendu on April 1, 2023.

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    PNG, 97.4 KB, uploaded by Dibyendu on April 1, 2023.

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    PNG, 105.9 KB, uploaded by Dibyendu on April 1, 2023.

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    Dibyendu
    Members 139 posts
    April 2, 2023, 5:10 p.m. April 2, 2023, 5:10 p.m.
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    Cosina Voigtlander Nokton D35mm F1.2 (Z mount)

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    Related patent JP2022-128635A

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    PNG, 148.9 KB, uploaded by Dibyendu on April 2, 2023.

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    PNG, 39.0 KB, uploaded by Dibyendu on April 2, 2023.

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    bclaff
    Members 21 posts
    April 7, 2023, 2:54 p.m. April 7, 2023, 2:54 p.m.
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    Sony FE PZ 16-35mm F4 G
    Sony FE PZ 16-35mm F4 G.png

    Sony FE PZ 16-35mm F4 G.png

    PNG, 101.6 KB, uploaded by bclaff on April 7, 2023.

    Dibyendu likes this.

    favorite 1

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    bclaff
    Members 21 posts
    May 2, 2023, 12:56 a.m. May 2, 2023, 12:56 a.m.
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    Isco 135mm F2.8
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    PNG, 113.3 KB, uploaded by bclaff on May 2, 2023.

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    bclaff
    Members 21 posts
    May 2, 2023, 4:36 a.m. May 2, 2023, 4:36 a.m.
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    Isco Westrogon 24mm F4
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    PNG, 110.3 KB, uploaded by bclaff on May 2, 2023.

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    bclaff
    Members 21 posts
    May 4, 2023, 3:08 a.m. May 4, 2023, 3:08 a.m.
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    Canon RF15-30mm F4.5-6.3 IS STM
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    PNG, 103.1 KB, uploaded by bclaff on May 4, 2023.

    Dibyendu likes this.

    favorite 1

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    bclaff
    Members 21 posts
    May 11, 2023, 3:19 a.m. May 11, 2023, 3:19 a.m.
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    Leica Elmarit 28mm f2.8
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    PNG, 69.9 KB, uploaded by bclaff on May 11, 2023.

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    Iyou1
    Members 1 post
    May 11, 2023, 4:47 p.m. May 11, 2023, 4:47 p.m.
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    It seems that there are some problems with this patent. The original data give a 104mm focal length instead of 100mm, which is not within the margin of error. Also I sent you a PM :)

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    bclaff
    Members 21 posts
    May 11, 2023, 11:52 p.m. May 11, 2023, 11:52 p.m.
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    Cosina Voigtlander Nokton 50mm F1.0 Aspherical
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    PNG, 98.1 KB, uploaded by bclaff on May 11, 2023.

    Dibyendu likes this.

    favorite 1

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